diff --git a/railties/test/generators/app_generator_test.rb b/railties/test/generators/app_generator_test.rb
index ffc5636467bf7ce47daf53702d631fd668fb1eee..6a3b5de9dea849e870ca92cfc5b05ae22459dcfd 100644
--- a/railties/test/generators/app_generator_test.rb
+++ b/railties/test/generators/app_generator_test.rb
@@ -9,6 +9,7 @@
   config.ru
   app/controllers
   app/helpers
+  app/mailers
   app/models
   app/views/layouts
   config/environments