diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index f7c3bc053d2773eb5cd67e6f3b113da9b9fd13a4..a6e4a8353b027e76c193a6dfcbaa36892a1f2a4a 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2454,6 +2454,8 @@ void tcp_skb_collapse_tstamp(struct sk_buff *skb,
 
 		shinfo->tx_flags |= tsflags;
 		shinfo->tskey = next_shinfo->tskey;
+		TCP_SKB_CB(skb)->txstamp_ack |=
+			TCP_SKB_CB(next_skb)->txstamp_ack;
 	}
 }