diff --git a/reactos/subsys/win32k/include/object.h b/reactos/subsys/win32k/include/object.h
index 859b4f21ccb..ad1565ac12a 100644
--- a/reactos/subsys/win32k/include/object.h
+++ b/reactos/subsys/win32k/include/object.h
@@ -13,7 +13,8 @@ typedef enum {
   otMenu,
   otAcceleratorTable,
   otCursorIcon,
-  otHookProc
+  otHookProc,
+  otMonitor
 } USER_OBJECT_TYPE;
 
 typedef struct _USER_OBJECT_HEADER