diff --git a/jupyterhub/app.py b/jupyterhub/app.py
index ec944acd..1acba858 100644
--- a/jupyterhub/app.py
+++ b/jupyterhub/app.py
@@ -1091,7 +1091,7 @@ class JupyterHub(Application):
             user.last_activity = max(user.last_activity, dt)
 
         self.db.commit()
-        yield self.proxy.check_routes(routes, self.users)
+        yield self.proxy.check_routes(self.users, routes)
     
     @gen.coroutine
     def start(self):