diff --git a/modules/rostests/winetests/oleaut32/olepicture.c b/modules/rostests/winetests/oleaut32/olepicture.c
index 0b5db1d9231..80a49d7416c 100644
--- a/modules/rostests/winetests/oleaut32/olepicture.c
+++ b/modules/rostests/winetests/oleaut32/olepicture.c
@@ -26,7 +26,9 @@
 
 #define COBJMACROS
 #define CONST_VTABLE
+#ifndef __REACTOS__
 #define NONAMELESSUNION
+#endif
 
 #include "wine/test.h"
 #include <windef.h>