diff --git a/content/base/crashtests/343889-1.html b/content/base/crashtests/343889-1.html
index 3dfcc92da2d..8ea8bc28d38 100644
--- a/content/base/crashtests/343889-1.html
+++ b/content/base/crashtests/343889-1.html
@@ -1,15 +1,18 @@
-<Html>
+<Html class="reftest-wait">
 <head>
 <meta http-equiv="content-type" content="text/html; charset=utf8">
 </head>
-<body>
+<body onload="boom()">
 <iframe src="#" id="data"></iframe>
 <script>
+function boom() {
 var d=document.getElementById('data').contentDocument;
 d.clear()
 var text='Тест';
 d.write(text);
-d.close()
+d.close();
+document.documentElement.removeAttribute("class");
+}
 </script>
 </body>
 </html>
