diff --git a/lib/list.js b/lib/list.js
index 27349340..17a367ff 100644
--- a/lib/list.js
+++ b/lib/list.js
@@ -29,6 +29,7 @@ function List(data, type, parent) {
         Object.defineProperty(list, data[i].id, {
             writable: true,
             enumerable: false,
+            configurable: true,
             value:  data[i]
         });
         if (list.nextid <= data[i].id) {