diff --git a/src/browser/InAppBrowserProxy.js b/src/browser/InAppBrowserProxy.js
index 29912c7..a9926f6 100644
--- a/src/browser/InAppBrowserProxy.js
+++ b/src/browser/InAppBrowserProxy.js
@@ -21,6 +21,7 @@
 
 var cordova = require('cordova'),
     channel = require('cordova/channel'),
+    modulemapper = require('cordova/modulemapper'),
     urlutil = require('cordova/urlutil');
 
 var browserWrap,
@@ -74,7 +75,7 @@ var IAB = {
         if (target === "_self" || !target) {
             window.location = strUrl;
         } else if (target === "_system") {
-            window.CDV_origSymbols['window.open'].call(window, strUrl, "_blank");
+            modulemapper.getOriginalSymbol(window, 'window.open').call(window, strUrl, "_blank");
         } else {
             // "_blank" or anything else
             if (!browserWrap) {