diff --git a/test/functional/attachments_controller_test.rb b/test/functional/attachments_controller_test.rb
index 311c725..834e6b0 100644
--- a/test/functional/attachments_controller_test.rb
+++ b/test/functional/attachments_controller_test.rb
@@ -211,6 +211,7 @@ class AttachmentsControllerTest < ActionController::TestCase
   end
 
   def test_show_file_without_container_should_be_denied
+    set_tmp_attachments_directory
     attachment = Attachment.create!(:file => uploaded_test_file("testfile.txt", "text/plain"), :author_id => 2)
 
     @request.session[:user_id] = 2