diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index 3705075..29a9bd5 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -617,6 +617,7 @@ void tcp_set_keepalive(struct sock *sk, int val)
 	else if (!val)
 		inet_csk_delete_keepalive_timer(sk);
 }
+EXPORT_SYMBOL_GPL(tcp_set_keepalive);
 
 
 static void tcp_keepalive_timer (unsigned long data)