diff --git a/reactos/w32api/include/winuser.h b/reactos/w32api/include/winuser.h
index b19a8cfe60c..7cb272f891a 100644
--- a/reactos/w32api/include/winuser.h
+++ b/reactos/w32api/include/winuser.h
@@ -689,6 +689,12 @@ extern "C" {
 #define MFS_HILITE 128
 #define MFS_UNCHECKED 0
 #define MFS_UNHILITE 0
+#define MNS_NOCHECK 0x80000000
+#define MNS_MODELESS 0x40000000
+#define MNS_DRAGDROP 0x20000000
+#define MNS_AUTODISMISS 0x10000000
+#define MNS_NOTIFYBYPOS 0x08000000
+#define MNS_CHECKORBMP 0x04000000
 #define GW_HWNDNEXT 2
 #define GW_HWNDPREV 3
 #define GW_CHILD 5