diff --git a/lib/gitlab/ci/build/policy/changes.rb b/lib/gitlab/ci/build/policy/changes.rb
index dc4f07bf05b95ee9e331c999b3731657a465fcec..7bf51519752295dc34fa07dff4a552e670b3f506 100644
--- a/lib/gitlab/ci/build/policy/changes.rb
+++ b/lib/gitlab/ci/build/policy/changes.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Gitlab
   module Ci
     module Build