diff --git a/include/net/tcp.h b/include/net/tcp.h
index 70e55d2..f7e1ab2 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -282,6 +282,7 @@
 extern int sysctl_tcp_challenge_ack_limit;
 extern unsigned int sysctl_tcp_notsent_lowat;
 extern int sysctl_tcp_min_tso_segs;
+extern int sysctl_tcp_autocorking;
 
 extern atomic_long_t tcp_memory_allocated;
 extern struct percpu_counter tcp_sockets_allocated;