diff --git a/sys/netinet/tcp_usrreq.c b/sys/netinet/tcp_usrreq.c
--- a/sys/netinet/tcp_usrreq.c
+++ b/sys/netinet/tcp_usrreq.c
@@ -211,6 +211,7 @@
 	    tp->t_state < TCPS_SYN_SENT,
 	    ("%s: inp %p not dropped or embryonic", __func__, inp));
 
+	tcp_timer_stop(tp);
 	tcp_discardcb(tp);
 	in_pcbfree(inp);
 }