diff --git a/layout/base/tests/chrome/test_bug533845.xul b/layout/base/tests/chrome/test_bug533845.xul
index 30d246fb3f5..1bc8b550af1 100644
--- a/layout/base/tests/chrome/test_bug533845.xul
+++ b/layout/base/tests/chrome/test_bug533845.xul
@@ -13,7 +13,7 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=533845
   <script type="application/javascript"
           src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
 <panel id="panel" width="50" height="50" onpopupshown="continueTest()">
-  <iframe type="content" id="contentFrame" src="data:text/html,&lt;html&gt;&lt;body onclick='document.body.textContent=1&gt;This is a panel!&lt;/body&gt;&lt;/html&gt;" width="500" height="500"/>
+  <iframe type="content" id="contentFrame" src="data:text/html,&lt;html&gt;&lt;body onclick='document.body.textContent=1'&gt;This is a panel!&lt;/body&gt;&lt;/html&gt;" width="500" height="500"/>
 </panel>
 <body xmlns="http://www.w3.org/1999/xhtml">
 <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=533845"
