diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index a41d5b377..7a5b3fdc2 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -5408,7 +5408,7 @@ ngx_http_upstream_add(ngx_conf_t *cf, ngx_url_t *u, ngx_uint_t flags)
     uscf->default_port = u->default_port;
     uscf->no_port = u->no_port;
 
-    if (u->naddrs == 1) {
+    if (u->naddrs == 1 && (u->port || u->family == AF_UNIX)) {
         uscf->servers = ngx_array_create(cf->pool, 1,
                                          sizeof(ngx_http_upstream_server_t));
         if (uscf->servers == NULL) {