diff --git a/lib/notify.js b/lib/notify.js
index d4b8e3ba3..d1077b39e 100644
--- a/lib/notify.js
+++ b/lib/notify.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const Handlebars = require('handlebars');
 const request = require('request');
 const Logger = require('./logger');