diff --git a/reactos/w32api/include/winuser.h b/reactos/w32api/include/winuser.h
index 99d7e16b0c2..e5e57061f78 100644
--- a/reactos/w32api/include/winuser.h
+++ b/reactos/w32api/include/winuser.h
@@ -153,6 +153,7 @@ extern "C" {
 #define CDS_FULLSCREEN	4
 #define CDS_GLOBAL	8
 #define CDS_SET_PRIMARY	16
+#define CDS_VIDEOPARAMETERS 20
 #define CDS_RESET	0x40000000
 #define CDS_SETRECT	0x20000000
 #define CDS_NORESET	0x10000000