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-rw-r--r--slirp/tcp_timer.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/slirp/tcp_timer.c b/slirp/tcp_timer.c
index 1214c2e6fa..8f5dd772ad 100644
--- a/slirp/tcp_timer.c
+++ b/slirp/tcp_timer.c
@@ -278,7 +278,8 @@ tcp_timers(register struct tcpcb *tp, int timer)
 			 * correspondent TCP to respond.
 			 */
 			tcp_respond(tp, &tp->t_template, (struct mbuf *)NULL,
-			    tp->rcv_nxt, tp->snd_una - 1, 0);
+			    tp->rcv_nxt, tp->snd_una - 1, 0,
+			    tp->t_socket->so_ffamily);
 			tp->t_timer[TCPT_KEEP] = TCPTV_KEEPINTVL;
 		} else
 			tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_IDLE;