diff --git a/jerry-core/ecma/base/ecma-helpers-string.c b/jerry-core/ecma/base/ecma-helpers-string.c
index d034c105a..0fefdc1e7 100644
--- a/jerry-core/ecma/base/ecma-helpers-string.c
+++ b/jerry-core/ecma/base/ecma-helpers-string.c
@@ -335,6 +335,33 @@ ecma_find_special_string (const lit_utf8_byte_t *string_p, /**< utf8 string */
   return NULL;
 } /* ecma_find_special_string */
 
+/**
+ * Allocate new ecma-string and fill it with characters from ascii characters
+ *
+ * @return pointer to ecma-string descriptor
+ */
+ecma_string_t *
+ecma_new_ecma_string_from_ascii (const lit_utf8_byte_t *string_p, /**< ascii string */
+                                 lit_utf8_size_t string_size) /**< string size */
+{
+  JERRY_ASSERT (string_p != NULL || string_size == 0);
+
+  ecma_string_t *string_desc_p = ecma_find_special_string (string_p, string_size);
+
+  if (string_desc_p != NULL)
+  {
+    return string_desc_p;
+  }
+
+  lit_utf8_byte_t *data_p;
+  string_desc_p = ecma_new_ecma_string_from_utf8_buffer (string_size, string_size, &data_p);
+
+  string_desc_p->u.hash = lit_utf8_string_calc_hash (string_p, string_size);
+  memcpy (data_p, string_p, string_size);
+
+  return string_desc_p;
+} /* ecma_new_ecma_string_from_ascii */
+
 /**
  * Allocate new ecma-string and fill it with characters from the utf8 string
  *
@@ -2449,8 +2476,7 @@ ecma_string_substr (const ecma_string_t *string_p, /**< pointer to an ecma strin
 
   if (string_length == buffer_size)
   {
-    ecma_string_p = ecma_new_ecma_string_from_utf8 (start_p + start_pos,
-                                                    (lit_utf8_size_t) end_pos);
+    ecma_string_p = ecma_new_ecma_string_from_utf8 (start_p + start_pos, (lit_utf8_size_t) end_pos);
   }
   else
   {
diff --git a/jerry-core/ecma/base/ecma-helpers.h b/jerry-core/ecma/base/ecma-helpers.h
index ec189759e..a4349536b 100644
--- a/jerry-core/ecma/base/ecma-helpers.h
+++ b/jerry-core/ecma/base/ecma-helpers.h
@@ -299,7 +299,10 @@ ecma_length_t ecma_op_advance_string_index (ecma_string_t *str_p, ecma_length_t
 ecma_string_t *ecma_new_map_key_string (ecma_value_t value);
 bool ecma_prop_name_is_map_key (ecma_string_t *string_p);
 #endif /* JERRY_BUILTIN_CONTAINER */
-ecma_string_t *ecma_new_ecma_string_from_utf8 (const lit_utf8_byte_t *string_p, lit_utf8_size_t string_size);
+ecma_string_t *ecma_new_ecma_string_from_ascii (const lit_utf8_byte_t *string_p,
+                                                lit_utf8_size_t string_size);
+ecma_string_t *ecma_new_ecma_string_from_utf8 (const lit_utf8_byte_t *string_p,
+                                               lit_utf8_size_t string_size);
 ecma_string_t *ecma_new_ecma_string_from_utf8_converted_to_cesu8 (const lit_utf8_byte_t *string_p,
                                                                   lit_utf8_size_t string_size);
 ecma_string_t *ecma_new_ecma_external_string_from_cesu8 (const lit_utf8_byte_t *string_p, lit_utf8_size_t string_size,
diff --git a/jerry-core/ecma/base/ecma-literal-storage.c b/jerry-core/ecma/base/ecma-literal-storage.c
index 934a35de5..37fd9bb49 100644
--- a/jerry-core/ecma/base/ecma-literal-storage.c
+++ b/jerry-core/ecma/base/ecma-literal-storage.c
@@ -165,9 +165,11 @@ ecma_finalize_lit_storage (void)
  */
 ecma_value_t
 ecma_find_or_create_literal_string (const lit_utf8_byte_t *chars_p, /**< string to be searched */
-                                    lit_utf8_size_t size) /**< size of the string */
+                                    lit_utf8_size_t size, /**< size of the string */
+                                    bool is_ascii) /**< encode of the string */
 {
-  ecma_string_t *string_p = ecma_new_ecma_string_from_utf8 (chars_p, size);
+  ecma_string_t *string_p = (is_ascii ? ecma_new_ecma_string_from_ascii (chars_p, size)
+                                      : ecma_new_ecma_string_from_utf8 (chars_p, size));
 
   if (ECMA_IS_DIRECT_STRING (string_p))
   {
@@ -702,7 +704,7 @@ ecma_snapshot_get_literal (const uint8_t *literal_base_p, /**< literal start */
 
   uint16_t length = *(const uint16_t *) literal_p;
 
-  return ecma_find_or_create_literal_string (literal_p + sizeof (uint16_t), length);
+  return ecma_find_or_create_literal_string (literal_p + sizeof (uint16_t), length, false);
 } /* ecma_snapshot_get_literal */
 
 /**
diff --git a/jerry-core/ecma/base/ecma-literal-storage.h b/jerry-core/ecma/base/ecma-literal-storage.h
index 4080e51f2..d9cf6b28d 100644
--- a/jerry-core/ecma/base/ecma-literal-storage.h
+++ b/jerry-core/ecma/base/ecma-literal-storage.h
@@ -40,7 +40,7 @@ typedef struct
 
 void ecma_finalize_lit_storage (void);
 
-ecma_value_t ecma_find_or_create_literal_string (const lit_utf8_byte_t *chars_p, lit_utf8_size_t size);
+ecma_value_t ecma_find_or_create_literal_string (const lit_utf8_byte_t *chars_p, lit_utf8_size_t size, bool is_ascii);
 ecma_value_t ecma_find_or_create_literal_number (ecma_number_t number_arg);
 #if JERRY_BUILTIN_BIGINT
 ecma_value_t ecma_find_or_create_literal_bigint (ecma_value_t bigint);
diff --git a/jerry-core/ecma/builtin-objects/ecma-builtin-helpers-date.c b/jerry-core/ecma/builtin-objects/ecma-builtin-helpers-date.c
index 9d3a1529c..36a96923b 100644
--- a/jerry-core/ecma/builtin-objects/ecma-builtin-helpers-date.c
+++ b/jerry-core/ecma/builtin-objects/ecma-builtin-helpers-date.c
@@ -680,7 +680,7 @@ ecma_date_to_string_format (ecma_number_t datetime_number, /**< datetime */
 
   JERRY_ASSERT (dest_p <= date_buffer + date_buffer_length);
 
-  return ecma_make_string_value (ecma_new_ecma_string_from_utf8 (date_buffer,
+  return ecma_make_string_value (ecma_new_ecma_string_from_ascii (date_buffer,
                                                                  (lit_utf8_size_t) (dest_p - date_buffer)));
 } /* ecma_date_to_string_format */
 
diff --git a/jerry-core/ecma/operations/ecma-bigint.c b/jerry-core/ecma/operations/ecma-bigint.c
index 6d2a2e275..de11b8159 100644
--- a/jerry-core/ecma/operations/ecma-bigint.c
+++ b/jerry-core/ecma/operations/ecma-bigint.c
@@ -250,7 +250,7 @@ ecma_bigint_to_string (ecma_value_t value, /**< BigInt value */
   }
 
   ecma_string_t *string_p;
-  string_p = ecma_new_ecma_string_from_utf8 (string_buffer_p + char_start_p, char_size_p - char_start_p);
+  string_p = ecma_new_ecma_string_from_ascii (string_buffer_p + char_start_p, char_size_p - char_start_p);
 
   jmem_heap_free_block (string_buffer_p, char_size_p);
   return string_p;
diff --git a/jerry-core/parser/js/common.h b/jerry-core/parser/js/common.h
index 9baffab97..05775f048 100644
--- a/jerry-core/parser/js/common.h
+++ b/jerry-core/parser/js/common.h
@@ -74,8 +74,9 @@ typedef enum
   LEXER_FLAG_SOURCE_PTR = (1 << 2), /**< the literal is directly referenced in the source code
                                      *   (no need to allocate memory) */
   LEXER_FLAG_LATE_INIT = (1 << 3), /**< initialize this variable after the byte code is freed */
+  LEXER_FLAG_ASCII = (1 << 4), /**< the literal contains only ascii characters */
 #if JERRY_ESNEXT
-  LEXER_FLAG_GLOBAL = (1 << 4), /**< this local identifier is not a let or const declaration */
+  LEXER_FLAG_GLOBAL = (1 << 5), /**< this local identifier is not a let or const declaration */
 #endif /* JERRY_ESNEXT */
 } lexer_literal_status_flags_t;
 
diff --git a/jerry-core/parser/js/js-lexer.c b/jerry-core/parser/js/js-lexer.c
index ef1a0c8b6..fe8d5a747 100644
--- a/jerry-core/parser/js/js-lexer.c
+++ b/jerry-core/parser/js/js-lexer.c
@@ -642,7 +642,7 @@ lexer_parse_identifier (parser_context_t *context_p, /**< context */
   parser_line_counter_t column = context_p->column;
   const uint8_t *source_end_p = context_p->source_end_p;
   size_t length = 0;
-  uint8_t has_escape = false;
+  lexer_lit_location_flags_t status_flags = LEXER_LIT_LOCATION_IS_ASCII;
 
   do
   {
@@ -657,7 +657,7 @@ lexer_parse_identifier (parser_context_t *context_p, /**< context */
         return true;
       }
 
-      has_escape = true;
+      status_flags = LEXER_LIT_LOCATION_HAS_ESCAPE;
 
 #if JERRY_ESNEXT
       if (source_p + 5 <= source_end_p && source_p[1] == LIT_CHAR_LOWERCASE_U)
@@ -711,6 +711,8 @@ lexer_parse_identifier (parser_context_t *context_p, /**< context */
 
     if (JERRY_UNLIKELY (code_point >= LIT_UTF8_2_BYTE_MARKER))
     {
+      status_flags &= (uint32_t) ~LEXER_LIT_LOCATION_IS_ASCII;
+
 #if JERRY_ESNEXT
       utf8_length = lit_read_code_point_from_utf8 (source_p,
                                                    (lit_utf8_size_t) (source_end_p - source_p),
@@ -738,7 +740,7 @@ lexer_parse_identifier (parser_context_t *context_p, /**< context */
       else if (source_p[0] >= LIT_UTF8_4_BYTE_MARKER)
       {
         decoded_length = 2 * 3;
-        has_escape = true;
+        status_flags = LEXER_LIT_LOCATION_HAS_ESCAPE;
       }
 #else /* !JERRY_ESNEXT */
       if (code_point < LIT_UTF8_4_BYTE_MARKER)
@@ -789,7 +791,7 @@ lexer_parse_identifier (parser_context_t *context_p, /**< context */
 
   context_p->token.type = LEXER_LITERAL;
   context_p->token.lit_location.type = LEXER_IDENT_LITERAL;
-  context_p->token.lit_location.has_escape = has_escape;
+  context_p->token.lit_location.status_flags = (uint8_t) status_flags;
 
   context_p->token.column = context_p->column;
   context_p->token.lit_location.char_p = context_p->source_p;
@@ -807,7 +809,7 @@ lexer_parse_identifier (parser_context_t *context_p, /**< context */
     const uint8_t *ident_start_p = context_p->source_p;
     uint8_t buffer_p[LEXER_KEYWORD_MAX_LENGTH];
 
-    if (JERRY_UNLIKELY (context_p->token.lit_location.has_escape))
+    if (JERRY_UNLIKELY (context_p->token.lit_location.status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE))
     {
       lexer_convert_ident_to_cesu8 (buffer_p, ident_start_p, (prop_length_t) length);
       ident_start_p = buffer_p;
@@ -953,7 +955,7 @@ lexer_parse_string (parser_context_t *context_p, /**< context */
   parser_line_counter_t original_line = line;
   parser_line_counter_t original_column = column;
   size_t length = 0;
-  uint8_t has_escape = false;
+  lexer_lit_location_flags_t status_flags = LEXER_LIT_LOCATION_IS_ASCII;
 
 #if JERRY_ESNEXT
   if (str_end_character == LIT_CHAR_RIGHT_BRACE)
@@ -986,7 +988,7 @@ lexer_parse_string (parser_context_t *context_p, /**< context */
         continue;
       }
 
-      has_escape = true;
+      status_flags = LEXER_LIT_LOCATION_HAS_ESCAPE;
 
       /* Newline is ignored. */
       if (*source_p == LIT_CHAR_CR)
@@ -1163,7 +1165,7 @@ lexer_parse_string (parser_context_t *context_p, /**< context */
        * after a backslash). Always converted to two 3 byte
        * long sequence. */
       length += 2 * 3;
-      has_escape = true;
+      status_flags = LEXER_LIT_LOCATION_HAS_ESCAPE;
       source_p += 4;
 #if JERRY_ESNEXT
       raw_length_adjust += 2;
@@ -1192,7 +1194,7 @@ lexer_parse_string (parser_context_t *context_p, /**< context */
          Note: ECMAScript v6, 11.8.6.1 <CR> or <CR><LF> are both normalized to <LF> */
       if (*source_p == LIT_CHAR_CR)
       {
-        has_escape = true;
+        status_flags = LEXER_LIT_LOCATION_HAS_ESCAPE;
         source_p++;
         length++;
         if (source_p < source_end_p
@@ -1261,7 +1263,7 @@ lexer_parse_string (parser_context_t *context_p, /**< context */
   context_p->token.lit_location.char_p = string_start_p;
   context_p->token.lit_location.length = (prop_length_t) length;
   context_p->token.lit_location.type = LEXER_STRING_LITERAL;
-  context_p->token.lit_location.has_escape = has_escape;
+  context_p->token.lit_location.status_flags = (uint8_t) status_flags;
 
   context_p->source_p = source_p + 1;
   context_p->line = line;
@@ -1328,7 +1330,7 @@ lexer_parse_number (parser_context_t *context_p) /**< context */
   context_p->token.extra_value = LEXER_NUMBER_DECIMAL;
   context_p->token.lit_location.char_p = source_p;
   context_p->token.lit_location.type = LEXER_NUMBER_LITERAL;
-  context_p->token.lit_location.has_escape = false;
+  context_p->token.lit_location.status_flags = LEXER_LIT_LOCATION_IS_ASCII;
 
   if (source_p[0] == LIT_CHAR_0
       && source_p + 1 < source_end_p)
@@ -2240,7 +2242,7 @@ lexer_convert_literal_to_chars (parser_context_t *context_p, /**< context */
 {
   JERRY_ASSERT (context_p->u.allocated_buffer_p == NULL);
 
-  if (!literal_p->has_escape)
+  if (!(literal_p->status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE))
   {
     return literal_p->char_p;
   }
@@ -2601,6 +2603,11 @@ lexer_construct_literal_object (parser_context_t *context_p, /**< context */
     status_flags |= LEXER_FLAG_USED;
   }
 
+  if (lit_location_p->status_flags & LEXER_LIT_LOCATION_IS_ASCII)
+  {
+    literal_p->status_flags |= LEXER_FLAG_ASCII;
+  }
+
   literal_p->status_flags = status_flags;
 
   context_p->lit_object.literal_p = literal_p;
@@ -3490,7 +3497,7 @@ lexer_compare_identifier_to_string (const lexer_lit_location_t *left_p, /**< lef
     return false;
   }
 
-  if (!left_p->has_escape)
+  if (!(left_p->status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE))
   {
     return memcmp (left_p->char_p, right_p, size) == 0;
   }
@@ -3518,12 +3525,12 @@ lexer_compare_identifiers (parser_context_t *context_p, /**< context */
     return false;
   }
 
-  if (!left_p->has_escape)
+  if (!(left_p->status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE))
   {
     return lexer_compare_identifier_to_chars (right_p->char_p, left_p->char_p, length);
   }
 
-  if (!right_p->has_escape)
+  if (!(right_p->status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE))
   {
     return lexer_compare_identifier_to_chars (left_p->char_p, right_p->char_p, length);
   }
@@ -3568,7 +3575,7 @@ lexer_current_is_literal (parser_context_t *context_p, /**< context */
     return false;
   }
 
-  if (!left_ident_p->has_escape && !right_ident_p->has_escape)
+  if (!((left_ident_p->status_flags | right_ident_p->status_flags) & LEXER_LIT_LOCATION_HAS_ESCAPE))
   {
     return memcmp (left_ident_p->char_p, right_ident_p->char_p, left_ident_p->length) == 0;
   }
@@ -3591,7 +3598,7 @@ lexer_string_is_use_strict (parser_context_t *context_p) /**< context */
                 && context_p->token.lit_location.type == LEXER_STRING_LITERAL);
 
   return (context_p->token.lit_location.length == 10
-          && !context_p->token.lit_location.has_escape
+          && !(context_p->token.lit_location.status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE)
           && memcmp (context_p->token.lit_location.char_p, "use strict", 10) == 0);
 } /* lexer_string_is_use_strict */
 
@@ -3649,7 +3656,7 @@ lexer_token_is_let (parser_context_t *context_p) /**< context */
   JERRY_ASSERT (context_p->token.type == LEXER_LITERAL);
 
   return (context_p->token.keyword_type == LEXER_KEYW_LET
-          && !context_p->token.lit_location.has_escape);
+          && !(context_p->token.lit_location.status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE));
 } /* lexer_token_is_let */
 
 /**
@@ -3667,7 +3674,7 @@ lexer_token_is_async (parser_context_t *context_p) /**< context */
                 || context_p->token.type == LEXER_TEMPLATE_LITERAL);
 
   return (context_p->token.keyword_type == LEXER_KEYW_ASYNC
-          && !context_p->token.lit_location.has_escape);
+          && !(context_p->token.lit_location.status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE));
 } /* lexer_token_is_async */
 
 #endif /* JERRY_ESNEXT */
diff --git a/jerry-core/parser/js/js-lexer.h b/jerry-core/parser/js/js-lexer.h
index 85c87f28e..e9f948cb5 100644
--- a/jerry-core/parser/js/js-lexer.h
+++ b/jerry-core/parser/js/js-lexer.h
@@ -305,6 +305,16 @@ typedef enum
 #endif /* JERRY_BUILTIN_BIGINT */
 } lexer_number_type_t;
 
+/**
+ * Lexer literal flags.
+ **/
+typedef enum
+{
+  LEXER_LIT_LOCATION_NO_OPTS = 0,           /**< no options */
+  LEXER_LIT_LOCATION_HAS_ESCAPE = (1 << 0), /**< binding has escape */
+  LEXER_LIT_LOCATION_IS_ASCII = (1 << 1),   /**< all characters are ascii characters */
+} lexer_lit_location_flags_t;
+
 /**
  * Lexer character (string / identifier) literal data.
  */
@@ -313,7 +323,7 @@ typedef struct
   const uint8_t *char_p;                     /**< start of identifier or string token */
   prop_length_t length;                      /**< length or index of a literal */
   uint8_t type;                              /**< type of the current literal */
-  uint8_t has_escape;                        /**< has escape sequences */
+  uint8_t status_flags;                      /**< any combination of lexer_lit_location_flags_t status bits */
 } lexer_lit_location_t;
 
 /**
diff --git a/jerry-core/parser/js/js-parser-expr.c b/jerry-core/parser/js/js-parser-expr.c
index e6570b835..0088b20fe 100644
--- a/jerry-core/parser/js/js-parser-expr.c
+++ b/jerry-core/parser/js/js-parser-expr.c
@@ -1922,7 +1922,7 @@ parser_parse_unary_expression (parser_context_t *context_p, /**< context */
         }
 #endif /* JERRY_MODULE_SYSTEM */
 
-        if (JERRY_UNLIKELY (context_p->token.lit_location.has_escape))
+        if (JERRY_UNLIKELY (context_p->token.lit_location.status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE))
         {
           parser_raise_error (context_p, PARSER_ERR_INVALID_KEYWORD);
         }
@@ -2281,7 +2281,7 @@ parser_parse_unary_expression (parser_context_t *context_p, /**< context */
       JERRY_ASSERT ((context_p->status_flags & PARSER_IS_GENERATOR_FUNCTION)
                     && !(context_p->status_flags & PARSER_DISALLOW_AWAIT_YIELD));
 
-      if (context_p->token.lit_location.has_escape)
+      if (context_p->token.lit_location.status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE)
       {
         parser_raise_error (context_p, PARSER_ERR_INVALID_KEYWORD);
       }
diff --git a/jerry-core/parser/js/js-parser-internal.h b/jerry-core/parser/js/js-parser-internal.h
index be9d99b6c..237051d82 100644
--- a/jerry-core/parser/js/js-parser-internal.h
+++ b/jerry-core/parser/js/js-parser-internal.h
@@ -724,6 +724,7 @@ void parser_emit_cbc_forward_branch (parser_context_t *context_p, uint16_t opcod
 parser_branch_node_t *parser_emit_cbc_forward_branch_item (parser_context_t *context_p, uint16_t opcode,
                                                            parser_branch_node_t *next_p);
 void parser_emit_cbc_backward_branch (parser_context_t *context_p, uint16_t opcode, uint32_t offset);
+ecma_string_t *parser_new_ecma_string_from_literal (lexer_literal_t *literal_p);
 void parser_set_branch_to_current_position (parser_context_t *context_p, parser_branch_t *branch_p);
 void parser_set_breaks_to_current_position (parser_context_t *context_p, parser_branch_node_t *current_p);
 void parser_set_continues_to_current_position (parser_context_t *context_p, parser_branch_node_t *current_p);
diff --git a/jerry-core/parser/js/js-parser-module.c b/jerry-core/parser/js/js-parser-module.c
index 31ccffb4b..3a7189e44 100644
--- a/jerry-core/parser/js/js-parser-module.c
+++ b/jerry-core/parser/js/js-parser-module.c
@@ -30,7 +30,7 @@
  */
 const lexer_lit_location_t lexer_default_literal =
 {
-  (const uint8_t *) "*default*", 9, LEXER_IDENT_LITERAL, false
+  (const uint8_t *) "*default*", 9, LEXER_IDENT_LITERAL, LEXER_LIT_LOCATION_IS_ASCII
 };
 
 /**
@@ -89,9 +89,7 @@ parser_module_append_export_name (parser_context_t *context_p) /**< parser conte
   }
 
   context_p->module_identifier_lit_p = context_p->lit_object.literal_p;
-
-  ecma_string_t *name_p = ecma_new_ecma_string_from_utf8 (context_p->lit_object.literal_p->u.char_p,
-                                                          context_p->lit_object.literal_p->prop.length);
+  ecma_string_t *name_p  = parser_new_ecma_string_from_literal (context_p->lit_object.literal_p);
 
   if (parser_module_check_duplicate_export (context_p, name_p))
   {
@@ -250,13 +248,11 @@ parser_module_parse_export_clause (parser_context_t *context_p) /**< parser cont
       lexer_next_token (context_p);
     }
 
-    lexer_literal_t *literal_p = PARSER_GET_LITERAL (local_name_index);
-    local_name_p = ecma_new_ecma_string_from_utf8 (literal_p->u.char_p, literal_p->prop.length);
+    local_name_p = parser_new_ecma_string_from_literal (PARSER_GET_LITERAL (local_name_index));
 
     if (export_name_index != PARSER_MAXIMUM_NUMBER_OF_LITERALS)
     {
-      lexer_literal_t *as_literal_p = PARSER_GET_LITERAL (export_name_index);
-      export_name_p = ecma_new_ecma_string_from_utf8 (as_literal_p->u.char_p, as_literal_p->prop.length);
+      export_name_p = parser_new_ecma_string_from_literal (PARSER_GET_LITERAL (export_name_index));
     }
     else
     {
@@ -353,13 +349,11 @@ parser_module_parse_import_clause (parser_context_t *context_p) /**< parser cont
       lexer_next_token (context_p);
     }
 
-    lexer_literal_t *literal_p = PARSER_GET_LITERAL (import_name_index);
-    import_name_p = ecma_new_ecma_string_from_utf8 (literal_p->u.char_p, literal_p->prop.length);
+    import_name_p = parser_new_ecma_string_from_literal (PARSER_GET_LITERAL (import_name_index));
 
     if (local_name_index != PARSER_MAXIMUM_NUMBER_OF_LITERALS)
     {
-      lexer_literal_t *as_literal_p = PARSER_GET_LITERAL (local_name_index);
-      local_name_p = ecma_new_ecma_string_from_utf8 (as_literal_p->u.char_p, as_literal_p->prop.length);
+      local_name_p = parser_new_ecma_string_from_literal (PARSER_GET_LITERAL (local_name_index));
     }
     else
     {
@@ -460,7 +454,7 @@ parser_module_handle_module_specifier (parser_context_t *context_p, /**< parser
   lexer_next_token (context_p);
 
   /* The lexer_next_token may throw an error, so the path is constructed after its call. */
-  ecma_string_t *path_string_p = ecma_new_ecma_string_from_utf8 (path_p->u.char_p, path_p->prop.length);
+  ecma_string_t *path_string_p = parser_new_ecma_string_from_literal (path_p);
 
   ecma_module_node_t *node_p = JERRY_CONTEXT (module_current_p)->imports_p;
   ecma_module_node_t *last_node_p = NULL;
diff --git a/jerry-core/parser/js/js-parser-statm.c b/jerry-core/parser/js/js-parser-statm.c
index ccc789fc0..bd69b6966 100644
--- a/jerry-core/parser/js/js-parser-statm.c
+++ b/jerry-core/parser/js/js-parser-statm.c
@@ -1174,7 +1174,7 @@ parser_parse_for_statement_start (parser_context_t *context_p) /**< context */
 
   if (context_p->token.type == LEXER_KEYW_AWAIT)
   {
-    if (JERRY_UNLIKELY (context_p->token.lit_location.has_escape))
+    if (JERRY_UNLIKELY (context_p->token.lit_location.status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE))
     {
       parser_raise_error (context_p, PARSER_ERR_INVALID_KEYWORD);
     }
@@ -1188,7 +1188,7 @@ parser_parse_for_statement_start (parser_context_t *context_p) /**< context */
 #if JERRY_ESNEXT
     if (context_p->token.type == LEXER_LITERAL
         && context_p->token.keyword_type == LEXER_KEYW_AWAIT
-        && !context_p->token.lit_location.has_escape)
+        && !(context_p->token.lit_location.status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE))
     {
       parser_raise_error (context_p, PARSER_ERR_FOR_AWAIT_NO_ASYNC);
     }
@@ -2447,8 +2447,7 @@ parser_parse_import_statement (parser_context_t *context_p) /**< parser context
       /* Handle ImportedDefaultBinding */
       lexer_construct_literal_object (context_p, &context_p->token.lit_location, LEXER_IDENT_LITERAL);
 
-      ecma_string_t *local_name_p = ecma_new_ecma_string_from_utf8 (context_p->lit_object.literal_p->u.char_p,
-                                                                    context_p->lit_object.literal_p->prop.length);
+      ecma_string_t *local_name_p = parser_new_ecma_string_from_literal (context_p->lit_object.literal_p);
 
       if (parser_module_check_duplicate_import (context_p, local_name_p))
       {
@@ -2496,8 +2495,7 @@ parser_parse_import_statement (parser_context_t *context_p) /**< parser context
 
       lexer_construct_literal_object (context_p, &context_p->token.lit_location, LEXER_IDENT_LITERAL);
 
-      ecma_string_t *local_name_p = ecma_new_ecma_string_from_utf8 (context_p->lit_object.literal_p->u.char_p,
-                                                                    context_p->lit_object.literal_p->prop.length);
+      ecma_string_t *local_name_p = parser_new_ecma_string_from_literal (context_p->lit_object.literal_p);
 
       if (parser_module_check_duplicate_import (context_p, local_name_p))
       {
@@ -2598,8 +2596,8 @@ parser_parse_export_statement (parser_context_t *context_p) /**< context */
         parser_parse_expression_statement (context_p, PARSE_EXPR_NO_COMMA | PARSE_EXPR_HAS_LITERAL);
       }
 
-      ecma_string_t *name_p = ecma_new_ecma_string_from_utf8 (context_p->module_identifier_lit_p->u.char_p,
-                                                              context_p->module_identifier_lit_p->prop.length);
+      ecma_string_t *name_p = parser_new_ecma_string_from_literal (context_p->module_identifier_lit_p);
+
       ecma_string_t *export_name_p = ecma_get_magic_string (LIT_MAGIC_STRING_DEFAULT);
 
       if (parser_module_check_duplicate_export (context_p, export_name_p))
@@ -2637,8 +2635,7 @@ parser_parse_export_statement (parser_context_t *context_p) /**< context */
         lexer_construct_literal_object (context_p, &context_p->token.lit_location, LEXER_NEW_IDENT_LITERAL);
 
         lexer_literal_t *literal_p = PARSER_GET_LITERAL (context_p->lit_object.index);
-        ecma_string_t *export_name_p = ecma_new_ecma_string_from_utf8 (literal_p->u.char_p,
-                                                                       literal_p->prop.length);
+        ecma_string_t *export_name_p = parser_new_ecma_string_from_literal (literal_p);
 
         if (parser_module_check_duplicate_export (context_p, export_name_p))
         {
diff --git a/jerry-core/parser/js/js-parser-tagged-template-literal.c b/jerry-core/parser/js/js-parser-tagged-template-literal.c
index 439818f3b..560a3e581 100644
--- a/jerry-core/parser/js/js-parser-tagged-template-literal.c
+++ b/jerry-core/parser/js/js-parser-tagged-template-literal.c
@@ -43,7 +43,7 @@ parser_tagged_template_literal_append_strings (parser_context_t *context_p, /**<
 {
   lexer_lit_location_t *lit_loc_p = &context_p->token.lit_location;
 
-  if (lit_loc_p->length == 0 && !lit_loc_p->has_escape)
+  if (lit_loc_p->length == 0 && !(lit_loc_p->status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE))
   {
     ecma_builtin_helper_def_prop_by_index (template_obj_p,
                                            prop_idx,
@@ -64,10 +64,13 @@ parser_tagged_template_literal_append_strings (parser_context_t *context_p, /**<
                                                             LEXER_STRING_NO_OPTS);
 
   ecma_string_t *raw_str_p;
-  ecma_string_t *cooked_str_p = ecma_new_ecma_string_from_utf8 (source_p, lit_loc_p->length);
+  ecma_string_t *cooked_str_p = ((lit_loc_p->status_flags & LEXER_FLAG_ASCII)
+                                  ? ecma_new_ecma_string_from_ascii (source_p, lit_loc_p->length)
+                                  : ecma_new_ecma_string_from_utf8 (source_p, lit_loc_p->length));
+
   parser_free_allocated_buffer (context_p);
 
-  if (lit_loc_p->has_escape)
+  if (lit_loc_p->status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE)
   {
     context_p->source_p = context_p->token.lit_location.char_p - 1;
     lexer_parse_string (context_p, LEXER_STRING_RAW);
@@ -76,7 +79,10 @@ parser_tagged_template_literal_append_strings (parser_context_t *context_p, /**<
                                                local_byte_array,
                                                LEXER_STRING_RAW);
 
-    raw_str_p = ecma_new_ecma_string_from_utf8 (source_p, lit_loc_p->length);
+    raw_str_p = ((lit_loc_p->status_flags & LEXER_FLAG_ASCII)
+                  ? ecma_new_ecma_string_from_ascii (source_p, lit_loc_p->length)
+                  : ecma_new_ecma_string_from_utf8 (source_p, lit_loc_p->length));
+
     parser_free_allocated_buffer (context_p);
   }
   else
diff --git a/jerry-core/parser/js/js-parser-util.c b/jerry-core/parser/js/js-parser-util.c
index ce0819cd4..3b590f0e9 100644
--- a/jerry-core/parser/js/js-parser-util.c
+++ b/jerry-core/parser/js/js-parser-util.c
@@ -14,6 +14,7 @@
  */
 
 #include "js-parser-internal.h"
+#include "ecma-helpers.h"
 
 #if JERRY_PARSER
 
@@ -650,6 +651,30 @@ parser_emit_cbc_backward_branch (parser_context_t *context_p, /**< context */
 #undef PARSER_CHECK_LAST_POSITION
 #undef PARSER_APPEND_TO_BYTE_CODE
 
+/**
+ * Helper function for parser.
+ *
+ * @return a new string based on encode.
+ */
+ecma_string_t *
+parser_new_ecma_string_from_literal (lexer_literal_t *literal_p) /**< literal */
+{
+  JERRY_ASSERT (literal_p != NULL);
+
+  ecma_string_t *new_string = NULL;
+
+  if (literal_p->status_flags & LEXER_FLAG_ASCII)
+  {
+    new_string = ecma_new_ecma_string_from_ascii (literal_p->u.char_p, literal_p->prop.length);
+  }
+  else
+  {
+    new_string = ecma_new_ecma_string_from_utf8 (literal_p->u.char_p, literal_p->prop.length);
+  }
+
+  return new_string;
+} /* parser_new_ecma_string_from_literal  */
+
 /**
  * Set a branch to the current byte code position
  */
diff --git a/jerry-core/parser/js/js-parser.c b/jerry-core/parser/js/js-parser.c
index 4ba85031a..5fa044800 100644
--- a/jerry-core/parser/js/js-parser.c
+++ b/jerry-core/parser/js/js-parser.c
@@ -130,7 +130,8 @@ parser_compute_indicies (parser_context_t *context_p, /**< context */
     if (char_p != NULL)
     {
       literal_p->u.value = ecma_find_or_create_literal_string (char_p,
-                                                               literal_p->prop.length);
+                                                               literal_p->prop.length,
+                                                               (literal_p->status_flags & LEXER_FLAG_ASCII) != 0);
 
       if (!(literal_p->status_flags & LEXER_FLAG_SOURCE_PTR))
       {
@@ -1274,7 +1275,8 @@ parser_post_processing (parser_context_t *context_p) /**< context */
         uint32_t source_data = literal_p->u.source_data;
         const uint8_t *char_p = context_p->source_end_p - (source_data & 0xfffff);
         ecma_value_t lit_value = ecma_find_or_create_literal_string (char_p,
-                                                                     source_data >> 20);
+                                                                     source_data >> 20,
+                                                                     (literal_p->status_flags & LEXER_FLAG_ASCII) != 0);
         literal_pool_p[literal_p->prop.index] = lit_value;
       }
     }
@@ -2896,7 +2898,9 @@ parser_compiled_code_set_function_name (parser_context_t *context_p, /**< contex
     memcpy (name_buffer_p + 4, name_lit_p->u.char_p, name_lit_p->prop.length);
   }
 
-  *func_name_start_p = ecma_find_or_create_literal_string (name_buffer_p, name_length);
+  *func_name_start_p = ecma_find_or_create_literal_string (name_buffer_p,
+                                                           name_length,
+                                                           (status_flags & LEXER_FLAG_ASCII) != 0);
 
   if (name_buffer_p != name_lit_p->u.char_p)
   {
diff --git a/jerry-core/parser/js/js-scanner-util.c b/jerry-core/parser/js/js-scanner-util.c
index dd1b5e61e..b3df249f5 100644
--- a/jerry-core/parser/js/js-scanner-util.c
+++ b/jerry-core/parser/js/js-scanner-util.c
@@ -406,9 +406,9 @@ scanner_scope_find_lexical_declaration (parser_context_t *context_p, /**< contex
     return false;
   }
 
-  if (JERRY_LIKELY (!literal_p->has_escape))
+  if (JERRY_LIKELY (!(literal_p->status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE)))
   {
-    name_p = ecma_new_ecma_string_from_utf8 (literal_p->char_p, literal_p->length);
+    name_p = parser_new_ecma_string_from_literal ((lexer_literal_t *) literal_p);
   }
   else
   {
@@ -416,7 +416,8 @@ scanner_scope_find_lexical_declaration (parser_context_t *context_p, /**< contex
 
     lexer_convert_ident_to_cesu8 (destination_p, literal_p->char_p, literal_p->length);
 
-    name_p = ecma_new_ecma_string_from_utf8 (destination_p, literal_p->length);
+    name_p = parser_new_ecma_string_from_literal ((lexer_literal_t *) literal_p);
+
     scanner_free (destination_p, literal_p->length);
   }
 
@@ -1114,7 +1115,7 @@ scanner_pop_literal_pool (parser_context_t *context_p, /**< context */
       }
 #endif /* JERRY_ESNEXT */
 
-      if (literal_p->has_escape)
+      if (literal_p->status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE)
       {
         type |= SCANNER_STREAM_HAS_ESCAPE;
       }
@@ -1384,13 +1385,13 @@ scanner_add_custom_literal (parser_context_t *context_p, /**< context */
     const uint8_t *char_p = literal_location_p->char_p;
     prop_length_t length = literal_location_p->length;
 
-    if (JERRY_LIKELY (!literal_location_p->has_escape))
+    if (JERRY_LIKELY (!(literal_location_p->status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE)))
     {
       while ((literal_p = (lexer_lit_location_t *) parser_list_iterator_next (&literal_iterator)) != NULL)
       {
         if (literal_p->length == length)
         {
-          if (JERRY_LIKELY (!literal_p->has_escape))
+          if (JERRY_LIKELY (!(literal_p->status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE)))
           {
             if (memcmp (literal_p->char_p, char_p, length) == 0)
             {
@@ -1401,7 +1402,7 @@ scanner_add_custom_literal (parser_context_t *context_p, /**< context */
           {
             /* The non-escaped version is preferred. */
             literal_p->char_p = char_p;
-            literal_p->has_escape = 0;
+            literal_p->status_flags = LEXER_LIT_LOCATION_NO_OPTS;
             return literal_p;
           }
         }
@@ -1494,13 +1495,13 @@ scanner_append_argument (parser_context_t *context_p, /**< context */
 
   JERRY_ASSERT (SCANNER_LITERAL_POOL_MAY_HAVE_ARGUMENTS (literal_pool_p->status_flags));
 
-  if (JERRY_LIKELY (!context_p->token.lit_location.has_escape))
+  if (JERRY_LIKELY (!(context_p->token.lit_location.status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE)))
   {
     while ((literal_p = (lexer_lit_location_t *) parser_list_iterator_next (&literal_iterator)) != NULL)
     {
       if (literal_p->length == length)
       {
-        if (JERRY_LIKELY (!literal_p->has_escape))
+        if (JERRY_LIKELY (!(literal_p->status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE)))
         {
           if (memcmp (literal_p->char_p, char_p, length) == 0)
           {
@@ -1603,7 +1604,7 @@ scanner_detect_invalid_var (parser_context_t *context_p, /**< context */
     parser_list_iterator_init (&literal_pool_p->literal_pool, &literal_iterator);
     lexer_lit_location_t *literal_p;
 
-    if (JERRY_LIKELY (!context_p->token.lit_location.has_escape))
+    if (JERRY_LIKELY (!(context_p->token.lit_location.status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE)))
     {
       while ((literal_p = (lexer_lit_location_t *) parser_list_iterator_next (&literal_iterator)) != NULL)
       {
@@ -1614,7 +1615,7 @@ scanner_detect_invalid_var (parser_context_t *context_p, /**< context */
             && (literal_p->type & SCANNER_LITERAL_IS_LOCAL) != SCANNER_LITERAL_IS_LOCAL
             && literal_p->length == length)
         {
-          if (JERRY_LIKELY (!literal_p->has_escape))
+          if (JERRY_LIKELY (!(literal_p->status_flags & LEXER_LIT_LOCATION_HAS_ESCAPE)))
           {
             if (memcmp (literal_p->char_p, char_p, length) == 0)
             {
@@ -1862,7 +1863,7 @@ scanner_append_hole (parser_context_t *context_p, scanner_context_t *scanner_con
   literal_p->char_p = NULL;
   literal_p->length = 0;
   literal_p->type = SCANNER_LITERAL_IS_ARG;
-  literal_p->has_escape = 0;
+  literal_p->status_flags = LEXER_LIT_LOCATION_NO_OPTS;
 } /* scanner_append_hole */
 
 #endif /* JERRY_ESNEXT */
@@ -2203,7 +2204,7 @@ scanner_try_scan_new_target (parser_context_t *context_p) /**< parser/scanner co
  */
 const lexer_lit_location_t lexer_arguments_literal =
 {
-  (const uint8_t *) "arguments", 9, LEXER_IDENT_LITERAL, false
+  (const uint8_t *) "arguments", 9, LEXER_IDENT_LITERAL, LEXER_LIT_LOCATION_IS_ASCII
 };
 
 /**
@@ -2279,7 +2280,8 @@ scanner_check_variables (parser_context_t *context_p) /**< context */
 
     literal.length = data_p[1];
     literal.type = LEXER_IDENT_LITERAL;
-    literal.has_escape = (data_p[0] & SCANNER_STREAM_HAS_ESCAPE) ? 1 : 0;
+    literal.status_flags = ((data_p[0] & SCANNER_STREAM_HAS_ESCAPE) ? LEXER_LIT_LOCATION_HAS_ESCAPE
+                                                                    : LEXER_LIT_LOCATION_NO_OPTS);
 
     lexer_construct_literal_object (context_p, &literal, LEXER_NEW_IDENT_LITERAL);
     literal.char_p += data_p[1];
@@ -2524,7 +2526,8 @@ scanner_create_variables (parser_context_t *context_p, /**< context */
         {
           literal.length = data_p[1];
           literal.type = LEXER_IDENT_LITERAL;
-          literal.has_escape = (data_p[0] & SCANNER_STREAM_HAS_ESCAPE) ? 1 : 0;
+          literal.status_flags = ((data_p[0] & SCANNER_STREAM_HAS_ESCAPE) ? LEXER_LIT_LOCATION_HAS_ESCAPE
+                                                                          : LEXER_LIT_LOCATION_NO_OPTS);
 
           /* Literal must be exists. */
           lexer_construct_literal_object (context_p, &literal, LEXER_IDENT_LITERAL);
@@ -2549,7 +2552,8 @@ scanner_create_variables (parser_context_t *context_p, /**< context */
 
     literal.length = data_p[1];
     literal.type = LEXER_IDENT_LITERAL;
-    literal.has_escape = (data_p[0] & SCANNER_STREAM_HAS_ESCAPE) ? 1 : 0;
+    literal.status_flags = ((data_p[0] & SCANNER_STREAM_HAS_ESCAPE) ? LEXER_LIT_LOCATION_HAS_ESCAPE
+                                                                    : LEXER_LIT_LOCATION_NO_OPTS);
 
     lexer_construct_literal_object (context_p, &literal, LEXER_NEW_IDENT_LITERAL);
     literal.char_p += data_p[1];
diff --git a/tests/unit-core/test-literal-storage.c b/tests/unit-core/test-literal-storage.c
index c471c03f6..2d3ff0b34 100644
--- a/tests/unit-core/test-literal-storage.c
+++ b/tests/unit-core/test-literal-storage.c
@@ -78,7 +78,7 @@ main (void)
       {
         lengths[j] = (lit_utf8_size_t) (rand () % max_characters_in_string + 1);
         generate_string (strings[j], lengths[j]);
-        ecma_find_or_create_literal_string (strings[j], lengths[j]);
+        ecma_find_or_create_literal_string (strings[j], lengths[j], false);
         strings[j][lengths[j]] = '\0';
         ptrs[j] = strings[j];
         TEST_ASSERT (ptrs[j]);
@@ -89,7 +89,7 @@ main (void)
         ptrs[j] = lit_get_magic_string_utf8 (msi);
         TEST_ASSERT (ptrs[j]);
         lengths[j] = (lit_utf8_size_t) lit_zt_utf8_string_size (ptrs[j]);
-        ecma_find_or_create_literal_string (ptrs[j], lengths[j]);
+        ecma_find_or_create_literal_string (ptrs[j], lengths[j], false);
       }
       else
       {
@@ -100,7 +100,7 @@ main (void)
     }
 
     /* Add empty string. */
-    ecma_find_or_create_literal_string (NULL, 0);
+    ecma_find_or_create_literal_string (NULL, 0, false);
 
     for (uint32_t j = 0; j < test_sub_iters; j++)
     {
@@ -108,8 +108,8 @@ main (void)
       ecma_value_t lit2;
       if (ptrs[j])
       {
-        lit1 = ecma_find_or_create_literal_string (ptrs[j], lengths[j]);
-        lit2 = ecma_find_or_create_literal_string (ptrs[j], lengths[j]);
+        lit1 = ecma_find_or_create_literal_string (ptrs[j], lengths[j], false);
+        lit2 = ecma_find_or_create_literal_string (ptrs[j], lengths[j], false);
         TEST_ASSERT (ecma_is_value_string (lit1));
         TEST_ASSERT (ecma_is_value_string (lit2));
         TEST_ASSERT (lit1 == lit2);
@@ -125,7 +125,7 @@ main (void)
     }
 
     /* Check empty string exists. */
-    TEST_ASSERT (ecma_find_or_create_literal_string (NULL, 0) != JMEM_CP_NULL);
+    TEST_ASSERT (ecma_find_or_create_literal_string (NULL, 0, false) != JMEM_CP_NULL);
   }
 
   ecma_finalize_lit_storage ();
diff --git a/tests/unit-core/test-stringbuilder.c b/tests/unit-core/test-stringbuilder.c
index 7aa4eab30..99a1defb3 100644
--- a/tests/unit-core/test-stringbuilder.c
+++ b/tests/unit-core/test-stringbuilder.c
@@ -35,7 +35,7 @@ main (void)
     ecma_stringbuilder_append_raw (&builder, string_data, sizeof (string_data) - 1);
     ecma_string_t *result_p = ecma_stringbuilder_finalize (&builder);
 
-    ecma_string_t *str_p = ecma_new_ecma_string_from_utf8 (string_data, sizeof (string_data) - 1);
+    ecma_string_t *str_p = ecma_new_ecma_string_from_ascii (string_data, sizeof (string_data) - 1);
     TEST_ASSERT (ecma_compare_ecma_strings (result_p, str_p));
     ecma_deref_ecma_string (result_p);
     ecma_deref_ecma_string (str_p);
@@ -57,7 +57,7 @@ main (void)
     ecma_stringbuilder_append_char (&builder, LIT_CHAR_LOWERCASE_A);
     ecma_string_t *result_p = ecma_stringbuilder_finalize (&builder);
 
-    ecma_string_t *str_p = ecma_new_ecma_string_from_utf8 (string_data, sizeof (string_data) - 1);
+    ecma_string_t *str_p = ecma_new_ecma_string_from_ascii (string_data, sizeof (string_data) - 1);
     TEST_ASSERT (ecma_compare_ecma_strings (result_p, str_p));
     ecma_deref_ecma_string (result_p);
     ecma_deref_ecma_string (str_p);
@@ -65,7 +65,7 @@ main (void)
 
   {
     static const lit_utf8_byte_t string_data[] = "A simple string";
-    ecma_string_t *str_p = ecma_new_ecma_string_from_utf8 (string_data, sizeof (string_data) - 1);
+    ecma_string_t *str_p = ecma_new_ecma_string_from_ascii (string_data, sizeof (string_data) - 1);
 
     ecma_stringbuilder_t builder = ecma_stringbuilder_create ();
     ecma_stringbuilder_append (&builder, str_p);
@@ -94,7 +94,7 @@ main (void)
     ecma_stringbuilder_append_char (&builder, LIT_CHAR_LOWERCASE_C);
     ecma_string_t *result_p = ecma_stringbuilder_finalize (&builder);
 
-    ecma_string_t *str_p = ecma_new_ecma_string_from_utf8 (string_data, sizeof (string_data) - 1);
+    ecma_string_t *str_p = ecma_new_ecma_string_from_ascii (string_data, sizeof (string_data) - 1);
     TEST_ASSERT (ecma_compare_ecma_strings (result_p, str_p));
     ecma_deref_ecma_string (result_p);
     ecma_deref_ecma_string (str_p);
@@ -125,7 +125,7 @@ main (void)
     ecma_string_t *result_p = ecma_stringbuilder_finalize (&builder);
 
     static const lit_utf8_byte_t expected_data[] = "1abc234string";
-    ecma_string_t *str_p = ecma_new_ecma_string_from_utf8 (expected_data, sizeof (expected_data) - 1);
+    ecma_string_t *str_p = ecma_new_ecma_string_from_ascii (expected_data, sizeof (expected_data) - 1);
     TEST_ASSERT (ecma_compare_ecma_strings (result_p, str_p));
     ecma_deref_ecma_string (result_p);
     ecma_deref_ecma_string (str_p);
@@ -177,14 +177,14 @@ main (void)
     ecma_stringbuilder_append_char (&builder, LIT_CHAR_1);
     ecma_stringbuilder_append_raw (&builder, string_data, sizeof (string_data) - 1);
 
-    ecma_string_t *another_string = ecma_new_ecma_string_from_utf8 (string_data, sizeof (string_data) - 1);
+    ecma_string_t *another_string = ecma_new_ecma_string_from_ascii (string_data, sizeof (string_data) - 1);
 
     ecma_stringbuilder_append (&builder, uint_str_p);
     ecma_stringbuilder_append_magic (&builder, LIT_MAGIC_STRING_STRING);
     ecma_string_t *result_p = ecma_stringbuilder_finalize (&builder);
 
     static const lit_utf8_byte_t expected_data[] = "1abc234string";
-    ecma_string_t *str_p = ecma_new_ecma_string_from_utf8 (expected_data, sizeof (expected_data) - 1);
+    ecma_string_t *str_p = ecma_new_ecma_string_from_ascii (expected_data, sizeof (expected_data) - 1);
     TEST_ASSERT (ecma_compare_ecma_strings (result_p, str_p));
     ecma_deref_ecma_string (result_p);
     ecma_deref_ecma_string (str_p);
@@ -201,7 +201,7 @@ main (void)
     ecma_string_t *result_p = ecma_stringbuilder_finalize (&builder);
 
     static const lit_utf8_byte_t expected_data[] = "234abcstring";
-    ecma_string_t *str_p = ecma_new_ecma_string_from_utf8 (expected_data, sizeof (expected_data) - 1);
+    ecma_string_t *str_p = ecma_new_ecma_string_from_ascii (expected_data, sizeof (expected_data) - 1);
     TEST_ASSERT (ecma_compare_ecma_strings (result_p, str_p));
     ecma_deref_ecma_string (result_p);
     ecma_deref_ecma_string (str_p);