diff --git a/test/unit/attachment_test.rb b/test/unit/attachment_test.rb
index 9a0af5c1b..85404a375 100644
--- a/test/unit/attachment_test.rb
+++ b/test/unit/attachment_test.rb
@@ -23,6 +23,7 @@ class AttachmentTest < ActiveSupport::TestCase
   fixtures :issues, :users
 
   def setup
+    set_tmp_attachments_directory
   end
 
   def test_create