diff --git a/test/functional/issues_custom_fields_visibility_test.rb b/test/functional/issues_custom_fields_visibility_test.rb
index 485b55be8..bdfdbb0ca 100644
--- a/test/functional/issues_custom_fields_visibility_test.rb
+++ b/test/functional/issues_custom_fields_visibility_test.rb
@@ -34,6 +34,7 @@ class IssuesCustomFieldsVisibilityTest < Redmine::ControllerTest
   def setup
     CustomField.destroy_all
     Issue.delete_all
+    Watcher.delete_all
 
     field_attributes = {:field_format => 'string', :is_for_all => true, :is_filter => true, :trackers => Tracker.all}
     @fields = []