diff --git a/pikaday.js b/pikaday.js
index 61642454d18999d9f9ea53702b0e98cbb93a6b53..1980bc5f09004a8c5c529dcf37890f1bbebcb76b 100755
--- a/pikaday.js
+++ b/pikaday.js
@@ -12,8 +12,7 @@
     if (typeof exports === 'object') {
         // CommonJS module
         // Load moment.js as an optional dependency
-        try { moment = require('moment'); } catch (e) {}
-        module.exports = factory(moment);
+        module.exports = factory(window.moment);
     } else if (typeof define === 'function' && define.amd) {
         // AMD. Register as an anonymous module.
         define(function (req)