diff --git a/include/net/tcp.h b/include/net/tcp.h
index 2c2f24ffa3831b6e8cb71621921ede0b74f737c1..7ffbcbf90a6408449dc3b92c8f7dc4a984689663 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -371,7 +371,6 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
 void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
 			 const struct tcphdr *th, unsigned int len);
 void tcp_rcv_space_adjust(struct sock *sk);
-void tcp_cleanup_rbuf(struct sock *sk, int copied);
 int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp);
 void tcp_twsk_destructor(struct sock *sk);
 ssize_t tcp_splice_read(struct socket *sk, loff_t *ppos,
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 28595a364f09382bfa0ce5c66f2f8fba11b7c519..4874a0efd34aa5b8f7e0b5c6dee0b64f962f649e 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1377,7 +1377,7 @@ static int tcp_peek_sndq(struct sock *sk, struct msghdr *msg, int len)
  * calculation of whether or not we must ACK for the sake of
  * a window update.
  */
-void tcp_cleanup_rbuf(struct sock *sk, int copied)
+static void tcp_cleanup_rbuf(struct sock *sk, int copied)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	bool time_to_ack = false;