diff --git a/test/unit/setting_test.rb b/test/unit/setting_test.rb
index 6c3c27d..95cd5e9 100644
--- a/test/unit/setting_test.rb
+++ b/test/unit/setting_test.rb
@@ -26,6 +26,9 @@ class SettingTest < ActiveSupport::TestCase
   end
 
   def test_read_default
+    Setting.delete_all
+    Setting.clear_cache
+
     assert_equal "Redmine", Setting.app_title
     assert Setting.self_registration?
     assert !Setting.login_required?