diff --git a/jerry-core/ecma/builtin-objects/ecma-builtin-reflect.c b/jerry-core/ecma/builtin-objects/ecma-builtin-reflect.c
index bd326259a..c083746ba 100644
--- a/jerry-core/ecma/builtin-objects/ecma-builtin-reflect.c
+++ b/jerry-core/ecma/builtin-objects/ecma-builtin-reflect.c
@@ -319,7 +319,17 @@ ecma_builtin_reflect_dispatch_routine (uint16_t builtin_routine_id, /**< built-i
     {
       JERRY_ASSERT (builtin_routine_id == ECMA_REFLECT_OBJECT_PREVENT_EXTENSIONS);
       ecma_object_t *obj_p = ecma_get_object_from_value (arguments_list[0]);
-      return ecma_builtin_object_object_prevent_extensions (obj_p);
+
+#if ENABLED (JERRY_ES2015_BUILTIN_PROXY)
+      if (ECMA_OBJECT_IS_PROXY (obj_p))
+      {
+        return ecma_proxy_object_prevent_extensions (obj_p);
+      }
+#endif /* !ENABLED (JERRY_ES2015_BUILTIN_PROXY) */
+
+      ecma_op_ordinary_object_prevent_extensions (obj_p);
+
+      return ECMA_VALUE_TRUE;
     }
   }
 } /* ecma_builtin_reflect_dispatch_routine */
diff --git a/tests/test262-es6-excludelist.xml b/tests/test262-es6-excludelist.xml
index 46022338e..0ab5852ca 100644
--- a/tests/test262-es6-excludelist.xml
+++ b/tests/test262-es6-excludelist.xml
@@ -166,9 +166,6 @@
   <test id="built-ins/Proxy/enumerate/trap-is-undefined.js"><reason></reason></test>
   <test id="built-ins/Proxy/getOwnPropertyDescriptor/trap-is-undefined.js"><reason></reason></test>
   <test id="built-ins/Proxy/name.js"><reason></reason></test>
-  <test id="built-ins/Proxy/preventExtensions/return-false.js"><reason></reason></test>
-  <test id="built-ins/Proxy/preventExtensions/return-true-target-is-not-extensible.js"><reason></reason></test>
-  <test id="built-ins/Proxy/preventExtensions/trap-is-undefined.js"><reason></reason></test>
   <test id="built-ins/Reflect/apply/name.js"><reason></reason></test>
   <test id="built-ins/Reflect/construct/name.js"><reason></reason></test>
   <test id="built-ins/Reflect/defineProperty/name.js"><reason></reason></test>
@@ -185,9 +182,7 @@
   <test id="built-ins/Reflect/has/name.js"><reason></reason></test>
   <test id="built-ins/Reflect/isExtensible/name.js"><reason></reason></test>
   <test id="built-ins/Reflect/ownKeys/name.js"><reason></reason></test>
-  <test id="built-ins/Reflect/preventExtensions/always-return-true-from-ordinary-object.js"><reason></reason></test>
   <test id="built-ins/Reflect/preventExtensions/name.js"><reason></reason></test>
-  <test id="built-ins/Reflect/preventExtensions/return-boolean-from-proxy-object.js"><reason></reason></test>
   <test id="built-ins/Reflect/set/name.js"><reason></reason></test>
   <test id="built-ins/Reflect/setPrototypeOf/name.js"><reason></reason></test>
   <test id="built-ins/RegExp/prototype/exec/get-sticky-coerce.js"><reason></reason></test>