diff --git a/extensions/GUI/CCControlExtension/CCScale9Sprite.h b/extensions/GUI/CCControlExtension/CCScale9Sprite.h
index 8ad9122420..bbd1df86a4 100644
--- a/extensions/GUI/CCControlExtension/CCScale9Sprite.h
+++ b/extensions/GUI/CCControlExtension/CCScale9Sprite.h
@@ -40,7 +40,7 @@ enum positions
  * @{
  */
 
-class CCScale9Sprite : public CCNode, CCRGBAProtocol
+class CCScale9Sprite : public CCNode, public CCRGBAProtocol
 {
 public:
     CCScale9Sprite();