diff --git a/test/test_helper.rb b/test/test_helper.rb
index e8474de..51eaae1 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -78,11 +78,13 @@ class ActiveSupport::TestCase
 
   # Use a temporary directory for attachment related tests
   def set_tmp_attachments_directory
-    Dir.mkdir "#{RAILS_ROOT}/tmp/test" unless File.directory?("#{RAILS_ROOT}/tmp/test")
-    Dir.mkdir "#{RAILS_ROOT}/tmp/test/attachments" unless File.directory?("#{RAILS_ROOT}/tmp/test/attachments")
-    Attachment.storage_path = "#{RAILS_ROOT}/tmp/test/attachments"
+    Dir.mkdir "#{Rails.root}/tmp/test" unless File.directory?("#{Rails.root}/tmp/test")
+    unless File.directory?("#{Rails.root}/tmp/test/attachments")
+      Dir.mkdir "#{Rails.root}/tmp/test/attachments"
+    end
+    Attachment.storage_path = "#{Rails.root}/tmp/test/attachments"
   end
-  
+
   def with_settings(options, &block)
     saved_settings = options.keys.inject({}) {|h, k| h[k] = Setting[k].dup; h}
     options.each {|k, v| Setting[k] = v}