diff --git a/examples/todomvc-backbone/js/app.js b/examples/todomvc-backbone/js/app.js
index 4a2e557450..5223364556 100644
--- a/examples/todomvc-backbone/js/app.js
+++ b/examples/todomvc-backbone/js/app.js
@@ -236,7 +236,7 @@ var TodoApp = React.createClass({
     var todoItems = this.props.todos.map(function(todo) {
       return (
         <TodoItem
-          key={Math.random()}
+          key={todo.cid}
           todo={todo}
           onToggle={todo.toggle.bind(todo)}
           onDestroy={todo.destroy.bind(todo)}