diff --git a/src/msw/button.cpp b/src/msw/button.cpp
index 35effc181d..6f5cb6782d 100644
--- a/src/msw/button.cpp
+++ b/src/msw/button.cpp
@@ -31,6 +31,7 @@
 #if wxUSE_BUTTON
 
 #ifndef WX_PRECOMP
+    #include "wx/app.h"
     #include "wx/button.h"
     #include "wx/brush.h"
     #include "wx/panel.h"