diff --git a/src/core/ngx_inet.h b/src/core/ngx_inet.h
index 95ba30b..cbff8fd 100644
--- a/src/core/ngx_inet.h
+++ b/src/core/ngx_inet.h
@@ -63,7 +63,7 @@
 
 
 in_addr_t ngx_inet_addr(u_char *text, size_t len);
-size_t ngx_sock_ntop(int family, struct sockaddr *sa, u_char *text, size_t len);
+size_t ngx_sock_ntop(struct sockaddr *sa, u_char *text, size_t len);
 size_t ngx_inet_ntop(int family, void *addr, u_char *text, size_t len);
 ngx_int_t ngx_ptocidr(ngx_str_t *text, void *cidr);
 ngx_int_t ngx_parse_url(ngx_pool_t *pool, ngx_url_t *u);