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 280a94c..b147679 100644
--- a/jerry-core/ecma/builtin-objects/ecma-builtin-helpers-date.c
+++ b/jerry-core/ecma/builtin-objects/ecma-builtin-helpers-date.c
@@ -36,12 +36,12 @@
 /**
  * Day names
  */
-const char day_names_p[7][3] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
+const char day_names_p[7][3] __attribute__((nonstring)) = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
 
 /**
  * Month names
  */
-const char month_names_p[12][3] = {
+const char month_names_p[12][3] __attribute__((nonstring)) = {
   "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
 };