diff --git a/include/wx/cmndata.h b/include/wx/cmndata.h
index 390ec00aed..45984bfb4c 100644
--- a/include/wx/cmndata.h
+++ b/include/wx/cmndata.h
@@ -209,6 +209,7 @@ public:
 #elif defined(__WXMAC__)
   void ConvertToNative();
   void ConvertFromNative();
+  void ValidateOrCreateNative() ;
 #endif
 
 public: