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
@@ -12608,12 +12608,9 @@
 		rsm->r_tim_lastsent[0] = rack_to_usec_ts(&rack->r_ctl.act_rcv_time);
 		rsm->r_rtr_cnt = 1;
 		rsm->r_rtr_bytes = 0;
-		if (tp->t_flags & TF_SENTFIN) {
-			rsm->r_end = tp->snd_max - 1;
+		if (tp->t_flags & TF_SENTFIN)
 			rsm->r_flags |= RACK_HAS_FIN;
-		} else {
-			rsm->r_end = tp->snd_max;
-		}
+		rsm->r_end = tp->snd_max;
 		if (tp->snd_una == tp->iss) {
 			/* The data space is one beyond snd_una */
 			rsm->r_flags |= RACK_HAS_SYN;