diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c
--- a/sys/netinet/tcp_input.c
+++ b/sys/netinet/tcp_input.c
@@ -460,6 +460,7 @@
 			ENTER_CONGRECOVERY(tp->t_flags);
 		tp->snd_nxt = tp->snd_max;
 		tp->t_flags &= ~TF_PREVVALID;
+		tp->t_rxtshift = 0;
 		tp->t_badrxtwin = 0;
 		break;
 	}