diff --git a/include/net/tcp.h b/include/net/tcp.h
index 788c99f..87d164b 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -400,6 +400,8 @@
 					int level, int optname,
 					char __user *optval, unsigned int optlen);
 extern void			tcp_set_keepalive(struct sock *sk, int val);
+extern void			tcp_syn_ack_timeout(struct sock *sk,
+						    struct request_sock *req);
 extern int			tcp_recvmsg(struct kiocb *iocb, struct sock *sk,
 					    struct msghdr *msg,
 					    size_t len, int nonblock,