diff --git a/layout/reftests/bugs/398289-1-ref.html b/layout/reftests/bugs/398289-1-ref.html
index 8b4cb5da2ecb..f2cd77cac50a 100644
--- a/layout/reftests/bugs/398289-1-ref.html
+++ b/layout/reftests/bugs/398289-1-ref.html
@@ -3,6 +3,7 @@
 <head>
   <script>
     window.onload = function () {
+      window.frames[0].document.getElementById("test").selectedIndex = 0;
       window.frames[0].document.getElementById("test").selectedIndex = 1;
       document.documentElement.className = "";
     }
