diff --git a/jerry-core/ecma/base/ecma-helpers-string.cpp b/jerry-core/ecma/base/ecma-helpers-string.cpp
index 78a59d1ea..538df18a2 100644
--- a/jerry-core/ecma/base/ecma-helpers-string.cpp
+++ b/jerry-core/ecma/base/ecma-helpers-string.cpp
@@ -27,6 +27,7 @@
 #include "ecma-lcache.h"
 #include "jrt.h"
 #include "jrt-libc-includes.h"
+#include "lit-char-helpers.h"
 #include "lit-magic-strings.h"
 #include "serializer.h"
 #include "vm.h"
@@ -1879,6 +1880,81 @@ ecma_string_substr (const ecma_string_t *string_p, /**< pointer to an ecma strin
   JERRY_UNREACHABLE ();
 } /* ecma_string_substr */
 
+/**
+ * Trim leading and trailing whitespace characters from string.
+ *
+ * @return trimmed ecma string
+ */
+ecma_string_t *
+ecma_string_trim (const ecma_string_t *string_p) /**< pointer to an ecma string */
+{
+  ecma_string_t *ret_string_p;
+
+  lit_utf8_size_t buffer_size = ecma_string_get_size (string_p);
+
+  if (buffer_size > 0)
+  {
+    MEM_DEFINE_LOCAL_ARRAY (utf8_str_p, buffer_size, lit_utf8_byte_t);
+    ecma_string_to_utf8_string (string_p, utf8_str_p, (ssize_t) buffer_size);
+
+    lit_utf8_iterator_t front = lit_utf8_iterator_create (utf8_str_p, buffer_size);
+
+    lit_utf8_iterator_t back = lit_utf8_iterator_create (utf8_str_p, buffer_size);
+    lit_utf8_iterator_seek_eos (&back);
+
+    lit_utf8_iterator_pos_t start = lit_utf8_iterator_get_pos (&back);
+    lit_utf8_iterator_pos_t end = lit_utf8_iterator_get_pos (&front);
+
+    ecma_char_t current;
+
+    /* Trim front. */
+    while (!lit_utf8_iterator_is_eos (&front))
+    {
+      current = lit_utf8_iterator_read_next (&front);
+      if (!lit_char_is_white_space (current)
+          && !lit_char_is_line_terminator (current))
+      {
+        lit_utf8_iterator_decr (&front);
+        start = lit_utf8_iterator_get_pos (&front);
+        break;
+      }
+    }
+
+    /* Trim back. */
+    while (!lit_utf8_iterator_is_bos (&back))
+    {
+      current = lit_utf8_iterator_read_prev (&back);
+      if (!lit_char_is_white_space (current)
+          && !lit_char_is_line_terminator (current))
+      {
+        lit_utf8_iterator_incr (&back);
+        end = lit_utf8_iterator_get_pos (&back);
+        break;
+      }
+    }
+
+    /* Construct new string. */
+    if (end.offset > start.offset)
+    {
+      ret_string_p = ecma_new_ecma_string_from_utf8 (utf8_str_p + start.offset,
+                                                     (lit_utf8_size_t) (end.offset - start.offset));
+    }
+    else
+    {
+      ret_string_p = ecma_get_magic_string (LIT_MAGIC_STRING__EMPTY);
+    }
+
+    MEM_FINALIZE_LOCAL_ARRAY (utf8_str_p);
+  }
+  else
+  {
+    ret_string_p = ecma_get_magic_string (LIT_MAGIC_STRING__EMPTY);
+  }
+
+  return ret_string_p;
+
+} /* ecma_string_trim */
+
 /**
  * @}
  * @}
diff --git a/jerry-core/ecma/base/ecma-helpers.h b/jerry-core/ecma/base/ecma-helpers.h
index 0046ba38f..eed78de66 100644
--- a/jerry-core/ecma/base/ecma-helpers.h
+++ b/jerry-core/ecma/base/ecma-helpers.h
@@ -147,6 +147,7 @@ extern bool ecma_is_ex_string_magic (const ecma_string_t *string_p, lit_magic_st
 
 extern lit_string_hash_t ecma_string_hash (const ecma_string_t *string_p);
 extern ecma_string_t *ecma_string_substr (const ecma_string_t *string_p, ecma_length_t, ecma_length_t);
+extern ecma_string_t *ecma_string_trim (const ecma_string_t *string_p);
 
 /* ecma-helpers-number.cpp */
 extern const ecma_number_t ecma_number_relative_eps;
diff --git a/jerry-core/ecma/builtin-objects/ecma-builtin-function.cpp b/jerry-core/ecma/builtin-objects/ecma-builtin-function.cpp
index b071fc7b7..8a8df5005 100644
--- a/jerry-core/ecma/builtin-objects/ecma-builtin-function.cpp
+++ b/jerry-core/ecma/builtin-objects/ecma-builtin-function.cpp
@@ -190,6 +190,7 @@ ecma_builtin_function_dispatch_construct (const ecma_value_t *arguments_list_p,
     lit_utf8_iterator_t iter = lit_utf8_iterator_create (start_p, str_size);
     ecma_length_t last_separator = lit_utf8_iterator_get_index (&iter);
     ecma_length_t end_position;
+    ecma_string_t *param_str_p;
 
     while (!lit_utf8_iterator_is_eos (&iter))
     {
@@ -200,7 +201,9 @@ ecma_builtin_function_dispatch_construct (const ecma_value_t *arguments_list_p,
         lit_utf8_iterator_decr (&iter);
         end_position = lit_utf8_iterator_get_index (&iter);
 
-        string_params_p[params_count] = ecma_string_substr (arguments_str_p, last_separator,  end_position);
+        param_str_p = ecma_string_substr (arguments_str_p, last_separator,  end_position);
+        string_params_p[params_count] = ecma_string_trim (param_str_p);
+        ecma_deref_ecma_string (param_str_p);
 
         lit_utf8_iterator_incr (&iter);
         last_separator = lit_utf8_iterator_get_index (&iter);
@@ -210,7 +213,9 @@ ecma_builtin_function_dispatch_construct (const ecma_value_t *arguments_list_p,
     }
 
     end_position = lit_utf8_string_length (start_p, str_size);
-    string_params_p[params_count] = ecma_string_substr (arguments_str_p, last_separator, end_position);
+    param_str_p = ecma_string_substr (arguments_str_p, last_separator, end_position);
+    string_params_p[params_count] = ecma_string_trim (param_str_p);
+    ecma_deref_ecma_string (param_str_p);
     params_count++;
 
     MEM_FINALIZE_LOCAL_ARRAY (start_p);
diff --git a/tests/jerry/function-construct.js b/tests/jerry/function-construct.js
index 757fd13f4..fed3df1b9 100644
--- a/tests/jerry/function-construct.js
+++ b/tests/jerry/function-construct.js
@@ -71,6 +71,15 @@ assert (f (1,2,3,4) === 10);
 f = new Function ("a" , "b", "c,d", "return a + b + c + d;");
 assert (f (1,2,3,4) === 10);
 
+var f = new Function (" a\t ,  b", "\u0020c", "return a + b + c;");
+assert (f (1,2,3) === 6);
+
+f = new Function ("a, \n b  \u0020", "c \t, d\n", "return a + b + c + d;");
+assert (f (1,2,3,4) === 10);
+
+f = new Function (" a\t" , "\nb ", " \u0020c , d ", "return a + b + c + d;");
+assert (f (1,2,3,4) === 10);
+
 try
 {
   new Function ({