diff --git a/railties/lib/test_help.rb b/railties/lib/test_help.rb
index 3ccbfebaf6cf8814d40aff81d4a6cd2b3d6116a8..b5c92c1790773caff5b6829c8dcd5bae137a2314 100644
--- a/railties/lib/test_help.rb
+++ b/railties/lib/test_help.rb
@@ -4,7 +4,7 @@
 
 require 'test/unit'
 require 'active_support/test_case'
-require 'active_controller/test_case'
+require 'action_controller/test_case'
 require 'action_view/test_case'
 require 'action_controller/integration'
 require 'action_mailer/test_case' if defined?(ActionMailer)