diff --git a/sys/netinet/tcp_stacks/bbr.c b/sys/netinet/tcp_stacks/bbr.c
--- a/sys/netinet/tcp_stacks/bbr.c
+++ b/sys/netinet/tcp_stacks/bbr.c
@@ -6781,8 +6781,6 @@
 			t = cts - rsm->r_tim_lastsent[0];
 		else
 			t = 1;
-		if ((int)t <= 0)
-			t = 1;
 		bbr->r_ctl.rc_last_rtt = t;
 		bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, 0,
 				    BBR_RTT_BY_EXACTMATCH, rsm->r_tim_lastsent[0], ack_type, to);
@@ -6823,8 +6821,6 @@
 					t = cts - rsm->r_tim_lastsent[i];
 				else
 					t = 1;
-				if ((int)t <= 0)
-					t = 1;
 				bbr->r_ctl.rc_last_rtt = t;
 				bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, uts, BBR_RTT_BY_TSMATCHING,
 						    rsm->r_tim_lastsent[i], ack_type, to);