diff --git a/src/worker.js b/src/worker.js
index 8cc3d35..ee40224 100644
--- a/src/worker.js
+++ b/src/worker.js
@@ -1,7 +1,8 @@
 import jsPDF from 'jspdf';
 import html2canvas from 'html2canvas';
 import { objType, createElement, cloneNode, toPx } from './utils.js';
-var Promise = require('es6-promise').Promise;
+import es6promise from 'es6-promise';
+var Promise = es6promise.Promise;
 
 /* ----- CONSTRUCTOR ----- */