diff --git a/include/linux/ipc.h b/include/linux/ipc.h
index ee11183..96988d1 100644
--- a/include/linux/ipc.h
+++ b/include/linux/ipc.h
@@ -89,6 +89,7 @@
 {
 	spinlock_t	lock;
 	int		deleted;
+	int		id;
 	key_t		key;
 	uid_t		uid;
 	gid_t		gid;