diff --git a/tests/wpt/web-platform-tests/XMLHttpRequest/preserve-ua-header-on-redirect.htm b/tests/wpt/web-platform-tests/XMLHttpRequest/preserve-ua-header-on-redirect.htm
index 141bddeb8ce..4d515a1b920 100644
--- a/tests/wpt/web-platform-tests/XMLHttpRequest/preserve-ua-header-on-redirect.htm
+++ b/tests/wpt/web-platform-tests/XMLHttpRequest/preserve-ua-header-on-redirect.htm
@@ -8,19 +8,18 @@
   <body>
     <div id="log"></div>
     <script>
-      var ua = "Servo/wptrunner";
       var test = async_test()
       test.step(function() {
         var client = new XMLHttpRequest()
           client.onreadystatechange = function() {
             test.step(function() {
               if(client.readyState == 4) {
-                assert_equals(client.responseText, "user-agent,")
+                assert_equals(client.responseText, 'user-agent: '+navigator.userAgent+'\n')
                 test.done()
               }
             })
           }
-        client.open("POST", "resources/redirect.py?location="+encodeURIComponent("inspect-headers.py?filter_value="+ua))
+        client.open("POST", "resources/redirect.py?location="+encodeURIComponent("inspect-headers.py?filter_name=user-agent"))
         client.send(null)
       })
     </script>
