diff --git a/lib/ace/worker/worker.js b/lib/ace/worker/worker.js
index e8bf0d3e..f3910e2a 100644
--- a/lib/ace/worker/worker.js
+++ b/lib/ace/worker/worker.js
@@ -1,5 +1,8 @@
 "no use strict";
 
+if (typeof window != "undefined" && window.document)
+    throw "atempt to load ace worker into main window instead of webWorker";
+
 var console = {
     log: function() {
         var msgs = Array.prototype.slice.call(arguments, 0);