--- a/layout/reftests/stylesheet-cloning/counter-style-rule-clone.html
+++ b/layout/reftests/stylesheet-cloning/counter-style-rule-clone.html
@@ -3,11 +3,11 @@
 <link rel="stylesheet" href="data:text/css,@counter-style a { system: fixed; symbols: A B C D; suffix: '' }">
 <link rel="stylesheet" href="test-common.css">
 <ol style="list-style-type: a">
   <li><li><li><li><li>
 </ol>
 <script>
   onload = function() {
     var links = document.getElementsByTagName("link");
-    links[0].sheet.cssRules[0].symbols = "\25F0 \25F1 \25F2 \25F3";
+    links[0].sheet.cssRules[0].symbols = "\u25F0 \u25F1 \u25F2 \u25F3";
   }
 </script>
\ No newline at end of file