diff --git a/examples/example.js b/examples/example.js
index 47aefde9..4f372dc6 100644
--- a/examples/example.js
+++ b/examples/example.js
@@ -1,3 +1,5 @@
+'use strict'
+
 const fastJson = require('..')
 const stringify = fastJson({
   title: 'Example Schema',