diff --git a/cocos/scripting/javascript/script/jsb_cocos2d.js b/cocos/scripting/javascript/script/jsb_cocos2d.js
index 8149eaffab..2ab020b08a 100644
--- a/cocos/scripting/javascript/script/jsb_cocos2d.js
+++ b/cocos/scripting/javascript/script/jsb_cocos2d.js
@@ -652,7 +652,7 @@ cc.Class.extend = function (prop) {
         // All construction is actually done in the init method
         if (!initializing) {
             if (!this.ctor) {
-                if (this._is_nativeObj)
+                if (this.__nativeObj)
                     cc.log("No ctor function found! Please check whether `classes_need_extend` section in `ini` file like which in `tools/tojs/cocos2dx.ini`");
             }
             else {