--- a/js/xpconnect/tests/unit/test_sandbox_metadata.js
+++ b/js/xpconnect/tests/unit/test_sandbox_metadata.js
@@ -6,16 +6,18 @@
 
 function run_test()
 {
   let sandbox = Components.utils.Sandbox("http://www.blah.com", {
     metadata: "test metadata",
     addonId: "12345"
   });
 
+  Components.utils.importGlobalProperties(["XMLHttpRequest"]);
+
   Assert.equal(Components.utils.getSandboxMetadata(sandbox), "test metadata");
   Assert.equal(Components.utils.getSandboxAddonId(sandbox), "12345");
 
   sandbox = Components.utils.Sandbox("http://www.blah.com", {
     metadata: { foopy: { bar: 2 }, baz: "hi" }
   });
 
   let metadata = Components.utils.getSandboxMetadata(sandbox);
@@ -28,18 +30,17 @@ function run_test()
 
   metadata = { foo: "bar" };
   Components.utils.setSandboxMetadata(sandbox, metadata);
   metadata.foo = "baz";
   metadata = Components.utils.getSandboxMetadata(sandbox);
   Assert.equal(metadata.foo, "bar");
 
   let thrown = false;
-  let reflector = Components.classes["@mozilla.org/xmlextras/xmlhttprequest;1"]
-                    .createInstance(Components.interfaces.nsIXMLHttpRequest);
+  let reflector = new XMLHttpRequest();
 
   try {
     Components.utils.setSandboxMetadata(sandbox, { foo: reflector });
   } catch(e) {
     thrown = true;
   }
 
   Assert.equal(thrown, true);