diff --git a/include/wx/display.h b/include/wx/display.h
index 4678672138..1c8d04379d 100644
--- a/include/wx/display.h
+++ b/include/wx/display.h
@@ -10,6 +10,8 @@
 #ifndef _WX_DISPLAY_H_BASE_
 #define _WX_DISPLAY_H_BASE_
 
+#include "wx/defs.h"
+
 // NB: no #if wxUSE_DISPLAY here, the display geometry part of this class (but
 //     not the video mode stuff) is always available but if wxUSE_DISPLAY == 0
 //     it becomes just a trivial wrapper around the old wxDisplayXXX() functions