diff --git a/lib/components/tabs.js b/lib/components/tabs.js
index 3adadd92..a9811328 100644
--- a/lib/components/tabs.js
+++ b/lib/components/tabs.js
@@ -26,6 +26,7 @@ export default class Tabs extends Component {
             <div className={css('title')}>{tabs[0].title}</div> :
             [
               <ul
+                key="list"
                 className={css('list')}
                 >
                 {
@@ -46,6 +47,7 @@ export default class Tabs extends Component {
                 }
               </ul>,
               isMac && <div
+                key="shim"
                 style={{borderColor}}
                 className={css('borderShim')}
                 />