diff --git a/src/accordion/docs/demo.js b/src/accordion/docs/demo.js
index 27127fb150..f6604313d0 100644
--- a/src/accordion/docs/demo.js
+++ b/src/accordion/docs/demo.js
@@ -15,6 +15,7 @@ function AccordionDemoCtrl($scope) {
   $scope.items = ['Item 1', 'Item 2', 'Item 3'];
 
   $scope.addItem = function() {
-    $scope.items.push('Item ' + $scope.items.length);
+    var newItemNo = $scope.items.length + 1;
+    $scope.items.push('Item ' + newItemNo);
   };
-}
\ No newline at end of file
+}