1 files changed, 2 insertions, 1 deletions
diff --git a/actionpack/lib/action_controller/railtie.rb b/actionpack/lib/action_controller/railtie.rb
index cd2dfafbe6..7496dd57b2 100644
--- a/actionpack/lib/action_controller/railtie.rb
+++ b/actionpack/lib/action_controller/railtie.rb
@@ -51,6 +51,7 @@ module ActionController
 
       ActiveSupport.on_load(:action_controller) do
         include app.routes.url_helpers
+        include app.routes.mounted_helpers(:app)
         options.each { |k,v| send("#{k}=", v) }
       end
     end
@@ -63,4 +64,4 @@ module ActionController
       ActionController::Routing::Routes = proxy
     end
   end
-end
-\ No newline at end of file
+end