diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h
index b773256..ddb9ccd 100644
--- a/include/net/netns/ipv6.h
+++ b/include/net/netns/ipv6.h
@@ -52,5 +52,6 @@
 #endif
 	struct sock		**icmp_sk;
 	struct sock             *ndisc_sk;
+	struct sock             *tcp_sk;
 };
 #endif