diff --git a/include/net/tcp.h b/include/net/tcp.h
index 10ae4c7..78880ba 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1150,6 +1150,7 @@
 /* - sock block */
 struct tcp_md5sig_info {
 	struct hlist_head	head;
+	struct rcu_head		rcu;
 };
 
 /* - pseudo header */