diff --git a/dlls/compstui/compstui_main.c b/dlls/compstui/compstui_main.c
index 41b24416176..0225036108d 100644
--- a/dlls/compstui/compstui_main.c
+++ b/dlls/compstui/compstui_main.c
@@ -21,7 +21,6 @@
 #include <stdarg.h>
 
 #define COBJMACROS
-#define NONAMELESSUNION
 
 #include "windef.h"
 #include "winbase.h"