diff --git a/modules/rostests/winetests/rpcrt4/cstub.c b/modules/rostests/winetests/rpcrt4/cstub.c
index e49a4c0a7a8..606107fcfd6 100644
--- a/modules/rostests/winetests/rpcrt4/cstub.c
+++ b/modules/rostests/winetests/rpcrt4/cstub.c
@@ -29,8 +29,8 @@
 #include <winnt.h>
 #include <winerror.h>
 
-
 #include "initguid.h"
+#include <ole2.h>
 #include "rpc.h"
 #include "rpcdce.h"
 #include "rpcproxy.h"