diff --git a/include/wx/msw/ole/dataobj.h b/include/wx/msw/ole/dataobj.h
index cdad68606c..f083f6f169 100644
--- a/include/wx/msw/ole/dataobj.h
+++ b/include/wx/msw/ole/dataobj.h
@@ -54,6 +54,8 @@ public:
   #ifdef  __DEBUG__
     // function to return symbolic name of clipboard format (debug messages)
     static const char *GetFormatName(wxDataFormat format);
+  #else // not used in release mode
+    #define GetFormatName(format) ""
   #endif
 
   // ctor & dtor
@@ -108,4 +110,4 @@ private:
 // @@@ TODO: wx{Bitmap|Metafile|...}DataObject
 // ----------------------------------------------------------------------------
 
-#endif  //_OLEDATAOBJ_H
\ No newline at end of file
+#endif  //_OLEDATAOBJ_H