diff --git a/CHANGELOG b/CHANGELOG
index 58d511a..9c67ac8 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,4 +1,5 @@
 *SVN*
+* Fix incorrect variable declaration in Event.fire. Closes #10329. [rubley]
 
 * Fix the way Selector handles [pseudoclass + combinator] with no space in between. Closes #9696. [kangax, fearphage, Andrew Dupont]
 
diff --git a/src/event.js b/src/event.js
index 6265d51..eae29ae 100644
--- a/src/event.js
+++ b/src/event.js
@@ -242,11 +242,12 @@ Object.extend(Event, (function() {
       if (element == document && document.createEvent && !element.dispatchEvent)
         element = document.documentElement;
         
+      var event;
       if (document.createEvent) {
-        var event = document.createEvent("HTMLEvents");
+        event = document.createEvent("HTMLEvents");
         event.initEvent("dataavailable", true, true);
       } else {
-        var event = document.createEventObject();
+        event = document.createEventObject();
         event.eventType = "ondataavailable";
       }