diff --git a/mozilla/calendar/base/content/preferences/timezones.js b/mozilla/calendar/base/content/preferences/timezones.js
index b4742e1e8bb..40ddf2b02d3 100644
--- a/mozilla/calendar/base/content/preferences/timezones.js
+++ b/mozilla/calendar/base/content/preferences/timezones.js
@@ -41,8 +41,8 @@
 var gTimezonesPane = {
     init: function () {
         var tzMenuList = document.getElementById("calendar.timezone.menulist");
-        prefValue = document.getElementById("calendar.timezone.local").value;
-        
+        var prefValue = document.getElementById("calendar.timezone.local").value;
+
         if (!prefValue) {
             prefValue = calendarDefaultTimezone();
             tzMenuList.value = prefValue;