diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index b5ec1e7856ab..7ce44f0bcb40 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2649,6 +2649,7 @@ static int mptcp_stream_connect(struct socket *sock, struct sockaddr *uaddr,
 		mptcp_subflow_early_fallback(msk, subflow);
 
 	WRITE_ONCE(msk->write_seq, subflow->idsn);
+	atomic64_set(&msk->snd_una, msk->write_seq);
 
 do_connect:
 	err = ssock->ops->connect(ssock, uaddr, addr_len, flags);