diff --git a/src/msw/ole/activex.cpp b/src/msw/ole/activex.cpp
index 46e813c61f..e8e7647a48 100644
--- a/src/msw/ole/activex.cpp
+++ b/src/msw/ole/activex.cpp
@@ -30,6 +30,8 @@
     #include "wx/math.h"
 #endif
 
+#include "wx/msw/dc.h"
+
 #include "wx/msw/ole/activex.h"
 // autointerfaces that we only use here
 WX_DECLARE_AUTOOLE(wxAutoIOleInPlaceSite, IOleInPlaceSite)