diff --git a/include/wx/weakref.h b/include/wx/weakref.h
index 73dcf5cdca..9ae506798b 100644
--- a/include/wx/weakref.h
+++ b/include/wx/weakref.h
@@ -305,7 +305,7 @@ protected:
 
 // Provide some basic types of weak references
 class WXDLLIMPEXP_FWD_BASE wxEvtHandler;
-class WXDLLIMPEXP_FWD_BASE wxWindow;
+class WXDLLIMPEXP_FWD_CORE wxWindow;
 
 typedef wxWeakRef<wxEvtHandler>  wxEvtHandlerRef;
 typedef wxWeakRef<wxWindow>      wxWindowRef;