diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 5a20ab2789ae..7fac5fac2097 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2869,6 +2869,10 @@ static void __mptcp_retrans(struct sock *sk)
 	msk->bytes_retrans += len;
 	dfrag->already_sent = max(dfrag->already_sent, len);
 
+	/* With csum enabled retransmission can send new data. */
+	if (after64(dfrag->already_sent + dfrag->data_seq, msk->snd_nxt))
+		WRITE_ONCE(msk->snd_nxt, dfrag->already_sent + dfrag->data_seq);
+
 reset_timer:
 	mptcp_check_and_set_pending(sk);