diff --git a/app/models/attachment.rb b/app/models/attachment.rb
index ff434d8f2..92eb9157a 100644
--- a/app/models/attachment.rb
+++ b/app/models/attachment.rb
@@ -43,7 +43,7 @@ class Attachment < ActiveRecord::Base
                                                         "LEFT JOIN #{Project.table_name} ON #{Document.table_name}.project_id = #{Project.table_name}.id"}
 
   cattr_accessor :storage_path
-  @@storage_path = Redmine::Configuration['attachments_storage_path'] || "#{RAILS_ROOT}/files"
+  @@storage_path = Redmine::Configuration['attachments_storage_path'] || "#{Rails.root}/files"
 
   def validate
     if self.filesize > Setting.attachment_max_size.to_i.kilobytes