diff --git a/net/ipv4/tcp_dctcp.c b/net/ipv4/tcp_dctcp.c
index ab37c6775630..51139175bf61 100644
--- a/net/ipv4/tcp_dctcp.c
+++ b/net/ipv4/tcp_dctcp.c
@@ -188,8 +188,8 @@ static void dctcp_ce_state_1_to_0(struct sock *sk)
 
 static void dctcp_update_alpha(struct sock *sk, u32 flags)
 {
-	const struct tcp_sock *tp = tcp_sk(sk);
 	struct dctcp *ca = inet_csk_ca(sk);
+	struct tcp_sock *tp = tcp_sk(sk);
 	u32 acked_bytes = tp->snd_una - ca->prior_snd_una;
 
 	/* If ack did not advance snd_una, count dupack as MSS size.
@@ -229,6 +229,13 @@ static void dctcp_update_alpha(struct sock *sk, u32 flags)
 		WRITE_ONCE(ca->dctcp_alpha, alpha);
 		dctcp_reset(tp, ca);
 	}
+
+	if (flags & CA_ACK_ECE) {
+		unsigned int cwnd = dctcp_ssthresh(sk);
+
+		if (cwnd != tp->snd_cwnd)
+			tp->snd_cwnd = cwnd;
+	}
 }
 
 static void dctcp_state(struct sock *sk, u8 new_state)