diff --git a/test/integration/default/controls/config_spec.rb b/test/integration/default/controls/config_spec.rb
index 16cc1a1..9b0ba25 100644
--- a/test/integration/default/controls/config_spec.rb
+++ b/test/integration/default/controls/config_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 control 'Timezone configuration' do
   title 'should match desired lines'
 
diff --git a/test/integration/default/controls/package_spec.rb b/test/integration/default/controls/package_spec.rb
index 05853bf..d76d32a 100644
--- a/test/integration/default/controls/package_spec.rb
+++ b/test/integration/default/controls/package_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 control 'Timezone package' do
   title 'should be installed'