diff --git a/net/ipv4/tcp_bbr2.c b/net/ipv4/tcp_bbr2.c
index 87f0c38fbcc40..5510adc92bbb4 100644
--- a/net/ipv4/tcp_bbr2.c
+++ b/net/ipv4/tcp_bbr2.c
@@ -2231,7 +2231,7 @@ static bool bbr2_fast_path(struct sock *sk, bool *update_model,
 	return false;
 }
 
-void bbr2_main(struct sock *sk, const struct rate_sample *rs)
+static void bbr2_main(struct sock *sk, const struct rate_sample *rs)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct bbr *bbr = inet_csk_ca(sk);