diff --git a/src/msw/datectrl.cpp b/src/msw/datectrl.cpp
index 4c45cc3408..3f97a7f7bc 100644
--- a/src/msw/datectrl.cpp
+++ b/src/msw/datectrl.cpp
@@ -33,6 +33,7 @@
 
 #include "wx/msw/wrapwin.h"
 #include "wx/msw/wrapcctl.h"
+#include "wx/msw/private.h"
 
 // ============================================================================
 // implementation