diff --git a/net/ipv4/tcp_htcp.c b/net/ipv4/tcp_htcp.c
index 632c05a75883da2c6c15f25b20d0a908a49c1980..08a02e6045c9c17733dbdac5c4873ce242bec9c5 100644
--- a/net/ipv4/tcp_htcp.c
+++ b/net/ipv4/tcp_htcp.c
@@ -225,7 +225,7 @@ static u32 htcp_recalc_ssthresh(struct sock *sk)
 	return max((tp->snd_cwnd * ca->beta) >> 7, 2U);
 }
 
-static void htcp_cong_avoid(struct sock *sk, u32 ack, s32 rtt,
+static void htcp_cong_avoid(struct sock *sk, u32 ack,
 			    u32 in_flight, int data_acked)
 {
 	struct tcp_sock *tp = tcp_sk(sk);