diff --git a/layout/base/tests/test_bug458898.html b/layout/base/tests/test_bug458898.html
index 15e4ed1711d..d3929692121 100644
--- a/layout/base/tests/test_bug458898.html
+++ b/layout/base/tests/test_bug458898.html
@@ -24,12 +24,13 @@ var win = window.openDialog("data:text/html,<div style='height:200px; width:100p
 
 // doesn't succeed on SeaMonkey currently, see bug 469331
 // mark it todo there instead
-var testfunc = (navigator.userAgent.match(/ SeaMonkey\//)) ? todo : ok;
+var testfunc_h = (navigator.userAgent.match(/ SeaMonkey\//)) ? todo : ok;
+var testfunc_w = (navigator.userAgent.match(/Windows/)) ? ok : testfunc_h;
 
 function loaded() {
   win.sizeToContent();
-  testfunc(win.innerWidth >= 100, "innerWidth");
-  testfunc(win.innerHeight >= 200, "innerHeight");
+  testfunc_w(win.innerWidth >= 100, "innerWidth");
+  testfunc_h(win.innerHeight >= 200, "innerHeight");
   win.close();
   SimpleTest.finish();
 }