diff --git a/plugins/corerouter/cr_common.c b/plugins/corerouter/cr_common.c
index 3d0a4013..7a7709df 100644
--- a/plugins/corerouter/cr_common.c
+++ b/plugins/corerouter/cr_common.c
@@ -59,6 +59,14 @@ void uwsgi_corerouter_setup_sockets(struct uwsgi_corerouter *ucr) {
                         			uwsgi.no_defer_accept = current_defer_accept;
 					}
 				}
+				// fix SERVER_PORT
+                                if (!ugs->port || !ugs->port_len) {
+                                        ugs->port = strchr(ugs->name, ':');
+                                        if (ugs->port) {
+                                                ugs->port++;
+                                                ugs->port_len = strlen(ugs->port);
+                                        }
+                                }
 				// put socket in non-blocking mode
 				uwsgi_socket_nb(ugs->fd);
 				uwsgi_log("%s bound on %s fd %d\n", ucr->name, ugs->name, ugs->fd);