diff --git a/include/wx/msw/ole/oleutils.h b/include/wx/msw/ole/oleutils.h
index 5bc5e19dfe..57f8efd0fe 100644
--- a/include/wx/msw/ole/oleutils.h
+++ b/include/wx/msw/ole/oleutils.h
@@ -21,6 +21,7 @@
 #include <ole2.h>
 #include "wx/intl.h"
 #include "wx/log.h"
+#include "wx/variant.h"
 
 // ============================================================================
 // General purpose functions and macros