diff --git a/include/wx/msw/toplevel.h b/include/wx/msw/toplevel.h
index 7b9f97886b..f508a5319a 100644
--- a/include/wx/msw/toplevel.h
+++ b/include/wx/msw/toplevel.h
@@ -59,6 +59,10 @@ public:
 
     virtual bool Show(bool show = TRUE);
 
+    // FIXME -- not yet moved from wxFrame to wxTLW
+    virtual bool ShowFullScreen(bool show, long style = wxFULLSCREEN_ALL) {}
+    virtual bool IsFullScreen() { return FALSE; }
+
     // implementation from now on
     // --------------------------