diff --git a/include/net/tcp.h b/include/net/tcp.h
index b91370f61be64a9ef2bcff2d8f20701f5ced09b1..6db10228113fc0cd2ce876035110dd43c6f0c794 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -552,6 +552,8 @@ void tcp_send_ack(struct sock *sk);
 void tcp_send_delayed_ack(struct sock *sk);
 void tcp_send_loss_probe(struct sock *sk);
 bool tcp_schedule_loss_probe(struct sock *sk);
+void tcp_skb_collapse_tstamp(struct sk_buff *skb,
+			     const struct sk_buff *next_skb);
 
 /* tcp_input.c */
 void tcp_resume_early_retransmit(struct sock *sk);
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 0edb07185c255d94e9260eaa192d3ac1c05b5f4a..c124c3c12f7c5c848d11e2a59d9e17ba93597411 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1309,6 +1309,7 @@ static bool tcp_shifted_skb(struct sock *sk, struct sk_buff *skb,
 	if (skb == tcp_highest_sack(sk))
 		tcp_advance_highest_sack(sk, skb);
 
+	tcp_skb_collapse_tstamp(prev, skb);
 	tcp_unlink_write_queue(skb, sk);
 	sk_wmem_free_skb(sk, skb);
 
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 5bc3c3062672c7113bd0167234cac0189f1077e6..441ae9da3a233fd96385853197fd3938959449e3 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2441,8 +2441,8 @@ u32 __tcp_select_window(struct sock *sk)
 	return window;
 }
 
-static void tcp_skb_collapse_tstamp(struct sk_buff *skb,
-				    const struct sk_buff *next_skb)
+void tcp_skb_collapse_tstamp(struct sk_buff *skb,
+			     const struct sk_buff *next_skb)
 {
 	const struct skb_shared_info *next_shinfo = skb_shinfo(next_skb);
 	u8 tsflags = next_shinfo->tx_flags & SKBTX_ANY_TSTAMP;