diff --git a/sys/netinet/tcp_stacks/rack.c b/sys/netinet/tcp_stacks/rack.c
--- a/sys/netinet/tcp_stacks/rack.c
+++ b/sys/netinet/tcp_stacks/rack.c
@@ -10478,6 +10478,7 @@
 	rack_handle_delayed_ack(tp, rack, tlen, 0);
 	if (tp->snd_una == tp->snd_max)
 		sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
+	tcp_handle_wakeup(tp, so);
 	return (1);
 }