diff --git a/include/net/tcp.h b/include/net/tcp.h
index a5af6be..dd99679 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1161,6 +1161,7 @@
 }
 
 bool tcp_prequeue(struct sock *sk, struct sk_buff *skb);
+bool tcp_add_backlog(struct sock *sk, struct sk_buff *skb);
 
 #undef STATE_TRACE