diff --git a/app/models/setting.rb b/app/models/setting.rb
index 80e084e9c..12b186fe8 100644
--- a/app/models/setting.rb
+++ b/app/models/setting.rb
@@ -75,7 +75,7 @@ class Setting < ActiveRecord::Base
                   TIS-620)
 
   cattr_accessor :available_settings
-  @@available_settings = YAML::load(File.open("#{RAILS_ROOT}/config/settings.yml"))
+  @@available_settings = YAML::load(File.open("#{Rails.root}/config/settings.yml"))
   Redmine::Plugin.all.each do |plugin|
     next unless plugin.settings
     @@available_settings["plugin_#{plugin.id}"] = {'default' => plugin.settings[:default], 'serialized' => true}