diff --git a/src/libecmabuiltins/ecma-builtins-internal.h b/src/libecmabuiltins/ecma-builtins-internal.h
index 9e9e05048..ec6f06aa4 100644
--- a/src/libecmabuiltins/ecma-builtins-internal.h
+++ b/src/libecmabuiltins/ecma-builtins-internal.h
@@ -57,164 +57,195 @@ ecma_builtin_bin_search_for_magic_string_id_in_array (const ecma_magic_string_id
 
 /**
  * List of built-in objects in format
- * 'macro (builtin_id, object_type, object_class, object_prototype_builtin_id, lowercase_name)'
+ * 'macro (builtin_id, object_type, object_class, object_prototype_builtin_id, is_extensible, lowercase_name)'
  */
 #define ECMA_BUILTIN_LIST(macro) \
   macro (OBJECT_PROTOTYPE, \
          TYPE_GENERAL, \
          OBJECT_UL, \
          ECMA_BUILTIN_ID__COUNT /* no prototype */, \
+         true, \
          object_prototype) \
   macro (FUNCTION_PROTOTYPE, \
          TYPE_FUNCTION, \
          FUNCTION_UL, \
          ECMA_BUILTIN_ID_OBJECT_PROTOTYPE, \
+         true, \
          function_prototype) \
   macro (ARRAY_PROTOTYPE, \
          TYPE_ARRAY, \
          ARRAY_UL, \
          ECMA_BUILTIN_ID_OBJECT_PROTOTYPE, \
+         true, \
          array_prototype) \
   macro (STRING_PROTOTYPE, \
          TYPE_GENERAL, \
          STRING_UL, \
          ECMA_BUILTIN_ID_OBJECT_PROTOTYPE, \
+         true, \
          string_prototype) \
   macro (BOOLEAN_PROTOTYPE, \
          TYPE_GENERAL, \
          BOOLEAN_UL, \
          ECMA_BUILTIN_ID_OBJECT_PROTOTYPE, \
+         true, \
          boolean_prototype) \
   macro (NUMBER_PROTOTYPE, \
          TYPE_GENERAL, \
          NUMBER_UL, \
          ECMA_BUILTIN_ID_OBJECT_PROTOTYPE, \
+         true, \
          number_prototype) \
   macro (OBJECT, \
          TYPE_FUNCTION, \
          OBJECT_UL, \
          ECMA_BUILTIN_ID_OBJECT_PROTOTYPE, \
+         true, \
          object) \
   macro (MATH, \
          TYPE_GENERAL, \
          MATH_UL, \
          ECMA_BUILTIN_ID_OBJECT_PROTOTYPE, \
+         true, \
          math) \
   macro (ARRAY, \
          TYPE_FUNCTION, \
          ARRAY_UL, \
          ECMA_BUILTIN_ID_FUNCTION_PROTOTYPE, \
+         true, \
          array) \
   macro (STRING, \
          TYPE_FUNCTION, \
          STRING_UL, \
          ECMA_BUILTIN_ID_FUNCTION_PROTOTYPE, \
+         true, \
          string) \
   macro (BOOLEAN, \
          TYPE_FUNCTION, \
          BOOLEAN_UL, \
          ECMA_BUILTIN_ID_FUNCTION_PROTOTYPE, \
+         true, \
          boolean) \
   macro (NUMBER, \
          TYPE_FUNCTION, \
          NUMBER_UL, \
          ECMA_BUILTIN_ID_FUNCTION_PROTOTYPE, \
+         true, \
          number) \
   macro (FUNCTION, \
          TYPE_FUNCTION, \
          FUNCTION_UL, \
          ECMA_BUILTIN_ID_FUNCTION_PROTOTYPE, \
+         true, \
          function) \
   macro (ERROR_PROTOTYPE, \
          TYPE_GENERAL, \
          ERROR_UL, \
          ECMA_BUILTIN_ID_OBJECT_PROTOTYPE, \
+         true, \
          error_prototype) \
   macro (ERROR, \
          TYPE_FUNCTION, \
          ERROR_UL, \
          ECMA_BUILTIN_ID_ERROR_PROTOTYPE, \
+         true, \
          error) \
   macro (EVAL_ERROR_PROTOTYPE, \
          TYPE_GENERAL, \
          ERROR_UL, \
          ECMA_BUILTIN_ID_ERROR_PROTOTYPE, \
+         true, \
          eval_error_prototype) \
   macro (EVAL_ERROR, \
          TYPE_FUNCTION, \
          ERROR_UL, \
          ECMA_BUILTIN_ID_EVAL_ERROR_PROTOTYPE, \
+         true, \
          eval_error) \
   macro (RANGE_ERROR_PROTOTYPE, \
          TYPE_GENERAL, \
          ERROR_UL, \
          ECMA_BUILTIN_ID_ERROR_PROTOTYPE, \
+         true, \
          range_error_prototype) \
   macro (RANGE_ERROR, \
          TYPE_FUNCTION, \
          ERROR_UL, \
          ECMA_BUILTIN_ID_RANGE_ERROR_PROTOTYPE, \
+         true, \
          range_error) \
   macro (REFERENCE_ERROR_PROTOTYPE, \
          TYPE_GENERAL, \
          ERROR_UL, \
          ECMA_BUILTIN_ID_ERROR_PROTOTYPE, \
+         true, \
          reference_error_prototype) \
   macro (REFERENCE_ERROR, \
          TYPE_FUNCTION, \
          ERROR_UL, \
          ECMA_BUILTIN_ID_REFERENCE_ERROR_PROTOTYPE, \
+         true, \
          reference_error) \
   macro (SYNTAX_ERROR_PROTOTYPE, \
          TYPE_GENERAL, \
          ERROR_UL, \
          ECMA_BUILTIN_ID_ERROR_PROTOTYPE, \
+         true, \
          syntax_error_prototype) \
   macro (SYNTAX_ERROR, \
          TYPE_FUNCTION, \
          ERROR_UL, \
          ECMA_BUILTIN_ID_SYNTAX_ERROR_PROTOTYPE, \
+         true, \
          syntax_error) \
   macro (TYPE_ERROR_PROTOTYPE, \
          TYPE_GENERAL, \
          ERROR_UL, \
          ECMA_BUILTIN_ID_ERROR_PROTOTYPE, \
+         true, \
          type_error_prototype) \
   macro (TYPE_ERROR, \
          TYPE_FUNCTION, \
          ERROR_UL, \
          ECMA_BUILTIN_ID_TYPE_ERROR_PROTOTYPE, \
+         true, \
          type_error) \
   macro (URI_ERROR_PROTOTYPE, \
          TYPE_GENERAL, \
          ERROR_UL, \
          ECMA_BUILTIN_ID_ERROR_PROTOTYPE, \
+         true, \
          uri_error_prototype) \
   macro (URI_ERROR, \
          TYPE_FUNCTION, \
          ERROR_UL, \
          ECMA_BUILTIN_ID_URI_ERROR_PROTOTYPE, \
+         true, \
          uri_error) \
   macro (TYPE_ERROR_THROWER, \
          TYPE_FUNCTION, \
          FUNCTION_UL, \
          ECMA_BUILTIN_ID_FUNCTION_PROTOTYPE, \
+         false, \
          type_error_thrower) \
   macro (COMPACT_PROFILE_ERROR, \
          TYPE_FUNCTION, \
          COMPACT_PROFILE_ERROR_UL, \
          ECMA_BUILTIN_ID_OBJECT_PROTOTYPE, \
+         false, \
          compact_profile_error) \
   macro (GLOBAL, \
          TYPE_GENERAL, \
          OBJECT_UL, \
          ECMA_BUILTIN_ID__COUNT /* no prototype */, \
+         true, \
          global)
 
 #define DECLARE_DISPATCH_ROUTINES(builtin_id, \
                                   object_type, \
                                   object_class, \
                                   object_prototype_builtin_id, \
+                                  is_extensible, \
                                   lowercase_name) \
 extern ecma_completion_value_t \
 ecma_builtin_ ## lowercase_name ## _dispatch_call (ecma_value_t *arguments_list_p, \
diff --git a/src/libecmabuiltins/ecma-builtins.c b/src/libecmabuiltins/ecma-builtins.c
index b42fcce6a..043eb49b5 100644
--- a/src/libecmabuiltins/ecma-builtins.c
+++ b/src/libecmabuiltins/ecma-builtins.c
@@ -94,9 +94,10 @@ static ecma_object_t*
 ecma_builtin_init_object (ecma_builtin_id_t obj_builtin_id, /**< built-in ID */
                           ecma_object_t* prototype_obj_p, /**< prototype object */
                           ecma_object_type_t obj_type, /**< object's type */
-                          ecma_magic_string_id_t obj_class) /**< object's class */
+                          ecma_magic_string_id_t obj_class, /**< object's class */
+                          bool is_extensible) /**< value of object's [[Extensible]] property */
 {
-  ecma_object_t *object_obj_p = ecma_create_object (prototype_obj_p, true, obj_type);
+  ecma_object_t *object_obj_p = ecma_create_object (prototype_obj_p, is_extensible, obj_type);
 
   ecma_property_t *class_prop_p = ecma_create_internal_property (object_obj_p,
                                                                  ECMA_INTERNAL_PROPERTY_CLASS);
@@ -176,6 +177,7 @@ ecma_instantiate_builtin (ecma_builtin_id_t id) /**< built-in id */
                      object_type, \
                      object_class, \
                      object_prototype_builtin_id, \
+                     is_extensible, \
                      lowercase_name) \
     case ECMA_BUILTIN_ID_ ## builtin_id: \
     { \
@@ -200,7 +202,8 @@ ecma_instantiate_builtin (ecma_builtin_id_t id) /**< built-in id */
       ecma_object_t *builtin_obj_p =  ecma_builtin_init_object (ECMA_BUILTIN_ID_ ## builtin_id, \
                                                                 prototype_obj_p, \
                                                                 ECMA_OBJECT_ ## object_type, \
-                                                                ECMA_MAGIC_STRING_ ## object_class); \
+                                                                ECMA_MAGIC_STRING_ ## object_class, \
+                                                                is_extensible); \
       ecma_builtin_objects [ECMA_BUILTIN_ID_ ## builtin_id] = builtin_obj_p; \
       \
       break; \
@@ -264,6 +267,7 @@ ecma_builtin_try_to_instantiate_property (ecma_object_t *object_p, /**< object *
                                     object_type, \
                                     object_class, \
                                     object_prototype_builtin_id, \
+                                    is_extensible, \
                                     lowercase_name) \
     case ECMA_BUILTIN_ID_ ## builtin_id: \
     { \
@@ -404,6 +408,7 @@ ecma_builtin_dispatch_call (ecma_object_t *obj_p, /**< built-in object */
                       object_type, \
                       object_class, \
                       object_prototype_builtin_id, \
+                      is_extensible, \
                       lowercase_name) \
       case ECMA_BUILTIN_ID_ ## builtin_id: \
       { \
@@ -468,6 +473,7 @@ ecma_builtin_dispatch_construct (ecma_object_t *obj_p, /**< built-in object */
                            object_type, \
                            object_class, \
                            object_prototype_builtin_id, \
+                           is_extensible, \
                            lowercase_name) \
     case ECMA_BUILTIN_ID_ ## builtin_id: \
       { \
@@ -524,6 +530,7 @@ ecma_builtin_dispatch_routine (ecma_builtin_id_t builtin_object_id, /**< built-i
                          object_type, \
                          object_class, \
                          object_prototype_builtin_id, \
+                         is_extensible, \
                          lowercase_name) \
     case ECMA_BUILTIN_ID_ ## builtin_id: \
       { \