diff --git a/test/test_plugin.js b/test/test_plugin.js
index 74e8e14..23bf3d9 100644
--- a/test/test_plugin.js
+++ b/test/test_plugin.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const lab = require('./lab');
 const plugin = require('../lib');
 const hapi = require('hapi');
diff --git a/test/test_utils.js b/test/test_utils.js
index 094bc32..5081b7b 100644
--- a/test/test_utils.js
+++ b/test/test_utils.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const lab = require('./lab');
 const utils = require('../lib/utils');