diff --git a/railties/lib/rails/generators/rails/app/templates/config.ru b/railties/lib/rails/generators/rails/app/templates/config.ru
index acbfe4e9ae124..541e200193aa3 100644
--- a/railties/lib/rails/generators/rails/app/templates/config.ru
+++ b/railties/lib/rails/generators/rails/app/templates/config.ru
@@ -1,7 +1,7 @@
 # Rack Dispatcher
 
 # Require your environment file to bootstrap Rails
-require File.dirname(__FILE__) + '/config/environment'
+require ::File.dirname(__FILE__) + '/config/environment'
 
 # Dispatch the request
 run ActionController::Dispatcher.new