diff --git a/test/test_helper.rb b/test/test_helper.rb
index d9882e7cc..e8474de15 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -78,8 +78,9 @@ class ActiveSupport::TestCase
 
   # Use a temporary directory for attachment related tests
   def set_tmp_attachments_directory
-    Rails.root.join('tmp/test/attachments').mkdir_p
-    Attachment.storage_path = "#{Rails.root}/tmp/test/attachments"
+    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"
   end
   
   def with_settings(options, &block)