diff --git a/spec/factories_spec.rb b/spec/factories_spec.rb
index 66b71d0f556..aa72a116be2 100644
--- a/spec/factories_spec.rb
+++ b/spec/factories_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe 'factories' do
diff --git a/spec/fast_spec_helper.rb b/spec/fast_spec_helper.rb
index a7810d72671..3fe3f9ff9a9 100644
--- a/spec/fast_spec_helper.rb
+++ b/spec/fast_spec_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'bundler/setup'
 
 ENV['GITLAB_ENV'] = 'test'
diff --git a/spec/rake_helper.rb b/spec/rake_helper.rb
index 298a520f5ca..77fece5842d 100644
--- a/spec/rake_helper.rb
+++ b/spec/rake_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 require 'rake'
 
diff --git a/spec/simplecov_env.rb b/spec/simplecov_env.rb
index 82236bb4201..c5b8a6db605 100644
--- a/spec/simplecov_env.rb
+++ b/spec/simplecov_env.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'simplecov'
 require 'active_support/core_ext/numeric/time'
 require_relative '../lib/gitlab/utils'
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 2142a43177a..bf87c078ac6 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require './spec/simplecov_env'
 SimpleCovEnv.start!