diff --git a/include/linux/nsproxy.h b/include/linux/nsproxy.h
index 0aba1b1..27f37c1 100644
--- a/include/linux/nsproxy.h
+++ b/include/linux/nsproxy.h
@@ -23,6 +23,7 @@
 struct nsproxy {
 	atomic_t count;
 	spinlock_t nslock;
+	unsigned long id;
 	struct uts_namespace *uts_ns;
 	struct ipc_namespace *ipc_ns;
 	struct mnt_namespace *mnt_ns;