diff --git a/jupyterhub/handlers.py b/jupyterhub/handlers.py
index e14439dd..743f2d39 100644
--- a/jupyterhub/handlers.py
+++ b/jupyterhub/handlers.py
@@ -126,7 +126,7 @@ class LoginHandler(BaseHandler):
                 user.server.base_url,
             ),
             data=json.dumps(dict(
-                target=user.server.url,
+                target=user.server.host,
                 user=user.name,
             )),
             headers={'Authorization': "token %s" % proxy.auth_token},