diff --git a/layout/reftests/bugs/281241-2.html b/layout/reftests/bugs/281241-2.xhtml
similarity index 51%
rename from layout/reftests/bugs/281241-2.html
rename to layout/reftests/bugs/281241-2.xhtml
index 3309fe0a2572..3c6df6da1003 100644
--- a/layout/reftests/bugs/281241-2.html
+++ b/layout/reftests/bugs/281241-2.xhtml
@@ -1,12 +1,11 @@
-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml">
  <body>
-  <table border>
+  <table border="">
    <colgroup width="100px">
      <script>var v = document.body.offsetHeight;</script>
-     <col width="500px">
+     <col width="500px"/>
    </colgroup>
-   <tr><td>&nbsp;</td></tr>
+   <tr><td>&#160;</td></tr>
   </table>
  </body>
 </html>
diff --git a/layout/reftests/bugs/reftest.list b/layout/reftests/bugs/reftest.list
index 95030b85c499..6853b0c77cd7 100644
--- a/layout/reftests/bugs/reftest.list
+++ b/layout/reftests/bugs/reftest.list
@@ -259,7 +259,7 @@ skip-if(MOZ_WIDGET_TOOLKIT=="cocoa") != 240536-resizer-ltr.xul 240536-resizer-rt
 == 280708-1a.html 280708-1-ref.html
 == 280708-1b.html 280708-1-ref.html
 == 281241-1.html 281241-1-ref.html
-== 281241-2.html 281241-1-ref.html
+== 281241-2.xhtml 281241-1-ref.html
 == 283686-1.html about:blank
 == 283686-2.html 283686-2-ref.html
 == 283686-3.html about:blank
