diff --git a/jerry-core/ecma/base/ecma-helpers.h b/jerry-core/ecma/base/ecma-helpers.h
index ca8f948ff1..39664fc2e7 100644
--- a/jerry-core/ecma/base/ecma-helpers.h
+++ b/jerry-core/ecma/base/ecma-helpers.h
@@ -379,7 +379,7 @@ bool ecma_number_is_finite (ecma_number_t num);
 ecma_number_t ecma_number_get_prev (ecma_number_t num);
 ecma_number_t ecma_number_get_next (ecma_number_t num);
 ecma_number_t ecma_number_trunc (ecma_number_t num);
-ecma_number_t ecma_number_remainder (ecma_number_t left_num, ecma_number_t right_num) __attribute__ ((optimize("0")));
+ecma_number_t ecma_number_remainder (ecma_number_t left_num, ecma_number_t right_num) __attribute__ ((optnone));
 ecma_number_t ecma_number_pow (ecma_number_t x, ecma_number_t y);
 ecma_value_t
 ecma_number_parse_int (const lit_utf8_byte_t *string_buff, lit_utf8_size_t string_buff_size, ecma_value_t radix);