diff --git a/railties/lib/rails/generators/rails/app/templates/config.ru b/railties/lib/rails/generators/rails/app/templates/config.ru
index 3702ad0466dfd..e6e73ece4cc6a 100644
--- a/railties/lib/rails/generators/rails/app/templates/config.ru
+++ b/railties/lib/rails/generators/rails/app/templates/config.ru
@@ -1,5 +1,5 @@
 # Require your environment file to bootstrap Rails
-require File.expand_path('../config/application',  __FILE__)
+require ::File.expand_path('../config/application',  __FILE__)
 
 # Dispatch the request
 run Rails.application.new