diff --git a/src/proxyClient.js b/src/proxyClient.js
index 3fc8313fe..8ab99d887 100644
--- a/src/proxyClient.js
+++ b/src/proxyClient.js
@@ -82,7 +82,7 @@ var worker = new Worker('{{{ filename }}}.js');
 WebGLClient.prefetch();
 
 setTimeout(function() {
-  worker.postMessage({ target: 'worker-init', width: Module.canvas.width, height: Module.canvas.height, preMain: true });
+  worker.postMessage({ target: 'worker-init', width: Module.canvas.width, height: Module.canvas.height, URL: document.URL, preMain: true });
 }, 0); // delay til next frame, to make sure html is ready
 
 var workerResponded = false;
diff --git a/src/proxyWorker.js b/src/proxyWorker.js
index 7647b5dad..1753dd334 100644
--- a/src/proxyWorker.js
+++ b/src/proxyWorker.js
@@ -271,6 +271,8 @@ document.styleSheets = [{
   }
 }];
 
+document.URL = 'http://worker.not.yet.ready.wait.for.window.onload?fake';
+
 function Audio() {
   Runtime.warnOnce('faking Audio elements, no actual sound will play');
 }
@@ -393,6 +395,8 @@ onmessage = function onmessage(message) {
       Module.canvas = document.createElement('canvas');
       Module.canvas.width_ = message.data.width;
       Module.canvas.height_ = message.data.height;
+      document.URL = message.data.URL;
+      window.fireEvent({ type: 'load' });
       removeRunDependency('worker-init');
       break;
     }