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
@@ -1692,16 +1692,25 @@
 	/*
 	 * If timestamps were negotiated during SYN/ACK and a
 	 * segment without a timestamp is received, silently drop
-	 * the segment.
+	 * the segment, unless it is a RST segment.
 	 * See section 3.2 of RFC 7323.
 	 */
 	if ((tp->t_flags & TF_RCVD_TSTMP) && !(to.to_flags & TOF_TS)) {
-		if ((s = tcp_log_addrs(inc, th, NULL, NULL))) {
-			log(LOG_DEBUG, "%s; %s: Timestamp missing, "
-			    "segment silently dropped\n", s, __func__);
-			free(s, M_TCPLOG);
+		if ((thflags & TH_RST) != 0) {
+			if ((s = tcp_log_addrs(inc, th, NULL, NULL))) {
+				log(LOG_DEBUG, "%s; %s: Timestamp missing, "
+				    "segment processed normally\n",
+				    s, __func__);
+				free(s, M_TCPLOG);
+			}
+		} else {
+			if ((s = tcp_log_addrs(inc, th, NULL, NULL))) {
+				log(LOG_DEBUG, "%s; %s: Timestamp missing, "
+				    "segment silently dropped\n", s, __func__);
+				free(s, M_TCPLOG);
+			}
+			goto drop;
 		}
-		goto drop;
 	}
 	/*
 	 * If timestamps were not negotiated during SYN/ACK and a
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
@@ -11463,10 +11463,11 @@
 	/*
 	 * If timestamps were negotiated during SYN/ACK and a
 	 * segment without a timestamp is received, silently drop
-	 * the segment.
+	 * the segment, unless it is a RST segment.
 	 * See section 3.2 of RFC 7323.
 	 */
-	if ((tp->t_flags & TF_RCVD_TSTMP) && !(to.to_flags & TOF_TS)) {
+	if ((tp->t_flags & TF_RCVD_TSTMP) && !(to.to_flags & TOF_TS) &&
+	    ((thflags & TH_RST) == 0)) {
 		retval = 0;
 		goto done_with_input;
 	}
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
@@ -10879,10 +10879,11 @@
 	/*
 	 * If timestamps were negotiated during SYN/ACK and a
 	 * segment without a timestamp is received, silently drop
-	 * the segment.
+	 * the segment, unless it is a RST segment.
 	 * See section 3.2 of RFC 7323.
 	 */
-	if ((tp->t_flags & TF_RCVD_TSTMP) && !(to.to_flags & TOF_TS)) {
+	if ((tp->t_flags & TF_RCVD_TSTMP) && !(to.to_flags & TOF_TS) &&
+	    ((thflags & TH_RST) == 0)) {
 		way_out = 5;
 		retval = 0;
 		goto done_with_input;