diff --git a/src/index.js b/src/index.js
index 540a995..1cc4b61 100644
--- a/src/index.js
+++ b/src/index.js
@@ -269,6 +269,7 @@ const VirtualList = Vue.component('virtual-list', {
         if (dataSource) {
           if (Object.prototype.hasOwnProperty.call(dataSource, dataKey)) {
             slots.push(h(Item, {
+              key: dataSource[dataKey],
               props: {
                 index,
                 tag: itemTag,