diff --git a/starlette/routing.py b/starlette/routing.py
index cc1be972fa..cdf5343682 100644
--- a/starlette/routing.py
+++ b/starlette/routing.py
@@ -354,7 +354,6 @@ def __init__(
         else:
             self.app = Router(routes=routes)
             self._routes = getattr(self.app, "routes", [])
-        self._user_app = self.app
         self.name = name
         self.path_regex, self.path_format, self.param_convertors = compile_path(
             self.path + "/{path:path}"