1 files changed, 2 insertions, 1 deletions
diff --git a/actionmailer/lib/action_mailer/railtie.rb b/actionmailer/lib/action_mailer/railtie.rb
index ce6d8cc5b5..c888e51b93 100644
--- a/actionmailer/lib/action_mailer/railtie.rb
+++ b/actionmailer/lib/action_mailer/railtie.rb
@@ -19,8 +19,9 @@ module ActionMailer
 
       ActiveSupport.on_load(:action_mailer) do
         include app.routes.url_helpers
+        include app.routes.mounted_helpers(:app)
         options.each { |k,v| send("#{k}=", v) }
       end
     end
   end
-end
-\ No newline at end of file
+end