diff --git a/dom/tests/mochitest/ajax/prototype/test/unit/ajax_test.js b/dom/tests/mochitest/ajax/prototype/test/unit/ajax_test.js
index 9d004650f24..c952547c977 100644
--- a/dom/tests/mochitest/ajax/prototype/test/unit/ajax_test.js
+++ b/dom/tests/mochitest/ajax/prototype/test/unit/ajax_test.js
@@ -32,20 +32,6 @@ new Test.Unit.Runner({
     this.assertEqual("Hello world!", h2.innerHTML);
   },
   
-  testAsynchronousRequest: function() {
-    this.assertEqual("", $("content").innerHTML);
-    
-    new Ajax.Request("../fixtures/hello.js", extendDefault({
-      asynchronous: true,
-      method: 'get',
-      evalJS: 'force'
-    }));
-    this.wait(1000, function() {
-      var h2 = $("content").firstChild;
-      this.assertEqual("Hello world!", h2.innerHTML);
-    });
-  },
-  
   testUpdater: function() {
     this.assertEqual("", $("content").innerHTML);