diff --git a/lib/ms-tunnel.js b/lib/ms-tunnel.js
index b464c19..e04dea4 100644
--- a/lib/ms-tunnel.js
+++ b/lib/ms-tunnel.js
@@ -46,7 +46,7 @@ const makeTunnelPlugin = (hubs, sstack) => (/** @type {any}} */ msConfig) => {
             hubs.get(key)?.cancel()
             hubs.delete(key)
           }
-          const obs = new HubObserver(sstack, key, address, rpc, res, onConnect)
+          const obs = new HubObserver(sstack, key, address, res, rpc, onConnect)
           hubs.set(key, obs)
         })
       )