2 files changed, 5 insertions, 1 deletions
diff --git a/actionpack/lib/action_dispatch/routing/route_set.rb b/actionpack/lib/action_dispatch/routing/route_set.rb
index 219fa37fcb..363bcbd2b0 100644
--- a/actionpack/lib/action_dispatch/routing/route_set.rb
+++ b/actionpack/lib/action_dispatch/routing/route_set.rb
@@ -307,7 +307,7 @@ module ActionDispatch
         routes = self
         MountedHelpers.class_eval do
           define_method "_#{name}" do
-            RoutesProxy.new(routes, self)
+            RoutesProxy.new(routes, self._routes_context)
           end
         end
 
diff --git a/actionpack/lib/action_dispatch/routing/url_for.rb b/actionpack/lib/action_dispatch/routing/url_for.rb
index 19db730b6a..e836cf7c8e 100644
--- a/actionpack/lib/action_dispatch/routing/url_for.rb
+++ b/actionpack/lib/action_dispatch/routing/url_for.rb
@@ -141,6 +141,10 @@ module ActionDispatch
         ensure
           @_routes = old_routes
         end
+
+        def _routes_context
+          self
+        end
     end
   end
 end