diff --git a/include/wx/msw/missing.h b/include/wx/msw/missing.h
index a249a1df37..04ef9d8298 100644
--- a/include/wx/msw/missing.h
+++ b/include/wx/msw/missing.h
@@ -528,8 +528,6 @@ typedef struct {
 
   WINCOMMCTRLAPI BOOL WINAPI _TrackMouseEvent(LPTRACKMOUSEEVENT lpEventTrack);
 
-  #define CCM_SETUNICODEFORMAT 8197
-  
 #endif
 
 // This didn't appear in mingw until 2.95.2