diff --git a/tools/example-zipper/exampleZipper.js b/tools/example-zipper/exampleZipper.js
index a92e45983a..4299ab8839 100644
--- a/tools/example-zipper/exampleZipper.js
+++ b/tools/example-zipper/exampleZipper.js
@@ -1,3 +1,5 @@
+'use strict';
+
 // Canonical path provides a consistent path (i.e. always forward slashes) across different OSes
 var path = require('canonical-path');
 var jsonfile = require('jsonfile');