diff --git a/lib/qizer.js b/lib/qizer.js
index <HASH>..<HASH> 100644
--- a/lib/qizer.js
+++ b/lib/qizer.js
@@ -10,6 +10,9 @@ module.exports = function (Promise) {
   });
 
   q.when = function (p) { return ( p && p.then ) ? p : Promise.resolve(p); };
+  q.usePolyfill = function () {
+  	Promise = require('./promise-polyfill');
+  };
 
   return q;
added .usePolyfill()