diff --git a/include/wx/display.h b/include/wx/display.h
index 4227c22a3a..69835ce6aa 100644
--- a/include/wx/display.h
+++ b/include/wx/display.h
@@ -20,6 +20,8 @@
 
 #include "wx/dynarray.h"
 
+class WXDLLEXPORT wxWindow;
+
 // ----------------------------------------------------------------------------
 // wxVideoMode: contains video mode parameters for a display
 // ----------------------------------------------------------------------------