diff --git a/mozilla/calendar/base/content/calendar-month-view.xml b/mozilla/calendar/base/content/calendar-month-view.xml
index 92a4dc39ed0..cc90a11191e 100644
--- a/mozilla/calendar/base/content/calendar-month-view.xml
+++ b/mozilla/calendar/base/content/calendar-month-view.xml
@@ -1435,6 +1435,7 @@
         // the calIObserver, and calICompositeObserver
         ({
           calView: this,
+          mBatchCount: 0,
 
           QueryInterface: function (aIID) {
             if (!aIID.equals(Ci.calIObserver) &&
@@ -1447,7 +1448,7 @@
           },
 
           onStartBatch: function() {
-            this.calView.mBatchCount++;
+            this.mBatchCount++;
           },
           onEndBatch: function() {
             this.mBatchCount--;