diff --git a/db/migrate/20200130115859_remove_bounce_score_threshold_deactivate_site_setting.rb b/db/migrate/20200130115859_remove_bounce_score_threshold_deactivate_site_setting.rb
index 34f0f265f70..251854ac013 100644
--- a/db/migrate/20200130115859_remove_bounce_score_threshold_deactivate_site_setting.rb
+++ b/db/migrate/20200130115859_remove_bounce_score_threshold_deactivate_site_setting.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RemoveBounceScoreThresholdDeactivateSiteSetting < ActiveRecord::Migration[6.0]
   def up
     execute "DELETE FROM site_settings WHERE name = 'bounce_score_threshold_deactivate'"