diff --git a/src/msw/toplevel.cpp b/src/msw/toplevel.cpp
index ecbe186ed7..a1b1de261e 100644
--- a/src/msw/toplevel.cpp
+++ b/src/msw/toplevel.cpp
@@ -31,6 +31,7 @@
 #ifndef WX_PRECOMP
     #include "wx/app.h"
     #include "wx/toplevel.h"
+    #include "wx/dialog.h"
     #include "wx/string.h"
     #include "wx/log.h"
     #include "wx/intl.h"