diff --git a/src/libecmaobjects/ecma-globals.h b/src/libecmaobjects/ecma-globals.h
index 87868913c..98718969d 100644
--- a/src/libecmaobjects/ecma-globals.h
+++ b/src/libecmaobjects/ecma-globals.h
@@ -744,6 +744,7 @@ typedef enum
   ECMA_MAGIC_STRING_SQRT, /**< "sqrt" */
   ECMA_MAGIC_STRING_TAN, /**< "tan" */
   ECMA_MAGIC_STRING_FROM_CHAR_CODE_UL, /**< "fromCharCode" */
+  ECMA_MAGIC_STRING_IS_ARRAY_UL, /**< "isArray" */
   ECMA_MAGIC_STRING__EMPTY, /**< "" */
   ECMA_MAGIC_STRING__COUNT /**< number of magic strings */
 } ecma_magic_string_id_t;
diff --git a/src/libecmaobjects/ecma-helpers-string.c b/src/libecmaobjects/ecma-helpers-string.c
index 2e15a8aa0..57a446d80 100644
--- a/src/libecmaobjects/ecma-helpers-string.c
+++ b/src/libecmaobjects/ecma-helpers-string.c
@@ -1340,6 +1340,7 @@ ecma_get_magic_string_zt (ecma_magic_string_id_t id) /**< magic string id */
     case ECMA_MAGIC_STRING_SQRT: return (ecma_char_t*) "sqrt";
     case ECMA_MAGIC_STRING_TAN: return (ecma_char_t*) "tan";
     case ECMA_MAGIC_STRING_FROM_CHAR_CODE_UL: return (ecma_char_t*) "fromCharCode";
+    case ECMA_MAGIC_STRING_IS_ARRAY_UL: return (ecma_char_t*) "isArray";
     case ECMA_MAGIC_STRING__EMPTY: return (ecma_char_t*) "";
     case ECMA_MAGIC_STRING__COUNT: break;
   }