diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 695f840acc14c8ce7b86156c75773fd6e03176bb..30c6a42b1f5b49a5aacd5d32f2ee650c18d9f503 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6319,7 +6319,7 @@ static void tcp_openreq_init(struct request_sock *req,
 	req->cookie_ts = 0;
 	tcp_rsk(req)->rcv_isn = TCP_SKB_CB(skb)->seq;
 	tcp_rsk(req)->rcv_nxt = TCP_SKB_CB(skb)->seq + 1;
-	tcp_rsk(req)->snt_synack = tcp_clock_us();
+	tcp_rsk(req)->snt_synack = 0;
 	tcp_rsk(req)->last_oow_ack_time = 0;
 	req->mss = rx_opt->mss_clamp;
 	req->ts_recent = rx_opt->saw_tstamp ? rx_opt->rcv_tsval : 0;
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 32061928b054275c546dae1141f45f0717018c78..0c4ed66dc1bf3441a9b7e5c9c37692333c92f17c 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -3247,7 +3247,11 @@ struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst,
 		skb->skb_mstamp_ns = cookie_init_timestamp(req);
 	else
 #endif
+	{
 		skb->skb_mstamp_ns = tcp_clock_ns();
+		if (!tcp_rsk(req)->snt_synack) /* Timestamp first SYNACK */
+			tcp_rsk(req)->snt_synack = tcp_skb_timestamp_us(skb);
+	}
 
 #ifdef CONFIG_TCP_MD5SIG
 	rcu_read_lock();