diff --git a/jerry-core/ecma/builtin-objects/ecma-builtin-number-prototype.c b/jerry-core/ecma/builtin-objects/ecma-builtin-number-prototype.c
index c024e0e7c..e5ba6b018 100644
--- a/jerry-core/ecma/builtin-objects/ecma-builtin-number-prototype.c
+++ b/jerry-core/ecma/builtin-objects/ecma-builtin-number-prototype.c
@@ -153,8 +153,8 @@ ecma_builtin_number_prototype_helper_round (lit_utf8_byte_t *digits_p, /**< [in,
 
     int i = 1;
 
-    /* Handle curry number. */
-    for (; i < (int) num_digits; i++)
+    /* Handle carry number. */
+    for (; i <= round_num; i++)
     {
       if (++digits_p[round_num - i] <= '9')
       {
@@ -164,7 +164,7 @@ ecma_builtin_number_prototype_helper_round (lit_utf8_byte_t *digits_p, /**< [in,
     }
 
     /* Prepend highest digit */
-    if (i >= (int) num_digits)
+    if (i > round_num)
     {
       memmove (digits_p + 1, digits_p, num_digits);
       digits_p[0] = '1';
diff --git a/tests/jerry/number-prototype-to-precision.js b/tests/jerry/number-prototype-to-precision.js
index 6184e1722..10b774092 100644
--- a/tests/jerry/number-prototype-to-precision.js
+++ b/tests/jerry/number-prototype-to-precision.js
@@ -36,6 +36,11 @@ assert((123456789012345678901.0).toPrecision("6") === "1.23457e+20");
 assert((123.56).toPrecision(1.3) === "1e+2");
 assert((123.56).toPrecision(21.9) === "123.560000000000000000");
 
+assert(Number(982).toPrecision(1) === "1e+3");
+assert(Number(982).toPrecision(2) === "9.8e+2");
+assert(Number(1499).toPrecision(1) === "1e+3");
+assert(Number(1500).toPrecision(1) === "2e+3");
+
 try {
     (12).toPrecision(0);
     assert(false);