diff --git a/src/core/ngx_inet.h b/src/core/ngx_inet.h
index d8f44c1..0555750 100644
--- a/src/core/ngx_inet.h
+++ b/src/core/ngx_inet.h
@@ -115,6 +115,8 @@
     size_t len);
 ngx_int_t ngx_parse_url(ngx_pool_t *pool, ngx_url_t *u);
 ngx_int_t ngx_inet_resolve_host(ngx_pool_t *pool, ngx_url_t *u);
+ngx_int_t ngx_cmp_sockaddr(struct sockaddr *sa1, socklen_t slen1,
+    struct sockaddr *sa2, socklen_t slen2, ngx_uint_t cmp_port);
 
 
 #endif /* _NGX_INET_H_INCLUDED_ */