diff --git a/reactos/regtests/winetests/user32/dce.c b/reactos/regtests/winetests/user32/dce.c
index 76beef2702e..9592dd22097 100755
--- a/reactos/regtests/winetests/user32/dce.c
+++ b/reactos/regtests/winetests/user32/dce.c
@@ -33,6 +33,8 @@
 
 #include "wine/test.h"
 
+#define DCX_USESTYLE 0x00010000
+
 static HWND hwnd_cache, hwnd_owndc, hwnd_classdc, hwnd_classdc2;
 
 /* test behavior of DC attributes with various GetDC/ReleaseDC combinations */