diff --git a/lib/setup.js b/lib/setup.js
index 90c7641..7b30ae8 100644
--- a/lib/setup.js
+++ b/lib/setup.js
@@ -66,16 +66,21 @@ function setup_test_instance(opt, cb) {
         bouncer.on('request', on_request(proxy.web));
         bouncer.on('upgrade', on_request(proxy.ws));
 
+        function local_url (port, path) {
+            var base = 'http://' + loopback + ':' + port;
+            return path ? base + path : base;
+        }
+
         function on_request(bounce) {
             return function(req, res) {
                 var args = [].slice.call(arguments);
                 if (is_control_req(req)) {
-                    args.push({ target: 'http://' + loopback + ':' + control_port });
+                    args.push({ target: local_url(control_port) });
                     bounce.apply(proxy, args);
                     return;
                 }
 
-                args.push({ target: 'http://' + loopback + ':' + support_port }, on_support_server_proxy_done);
+                args.push({ target: local_url(support_port) }, on_support_server_proxy_done);
                 bounce.apply(proxy, args);
             };
         }
@@ -105,7 +110,7 @@ function setup_test_instance(opt, cb) {
             debug('bouncer active on port %d', app_port);
 
             if (!tunnel) {
-                return cb(null, 'http://' + loopback + ':' + app_port + '/__zuul');
+                return cb(null, local_url(app_port, '/__zuul'));
             }
 
             tunnel.connect(app_port, cb);