diff --git a/app/models/ci/build.rb b/app/models/ci/build.rb
index 6f2b3543493..d3abb28d704 100644
--- a/app/models/ci/build.rb
+++ b/app/models/ci/build.rb
@@ -781,7 +781,7 @@ module Ci
       end
     end
 
-    def predefined_variables
+    def predefined_variables # rubocop:disable Metrics/AbcSize
       Gitlab::Ci::Variables::Collection.new.tap do |variables|
         variables.append(key: 'CI', value: 'true')
         variables.append(key: 'GITLAB_CI', value: 'true')
diff --git a/lib/gitlab/ci/config/normalizer.rb b/lib/gitlab/ci/config/normalizer.rb
index fc1efb67560..2dc408ac392 100644
--- a/lib/gitlab/ci/config/normalizer.rb
+++ b/lib/gitlab/ci/config/normalizer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Gitlab
   module Ci
     class Config
diff --git a/spec/lib/gitlab/ci/config/normalizer_spec.rb b/spec/lib/gitlab/ci/config/normalizer_spec.rb
index f1096cd3931..48b8217f77c 100644
--- a/spec/lib/gitlab/ci/config/normalizer_spec.rb
+++ b/spec/lib/gitlab/ci/config/normalizer_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'fast_spec_helper'
 
 describe Gitlab::Ci::Config::Normalizer do