diff --git a/src/components/structures/MessagePanel.js b/src/components/structures/MessagePanel.js
index 298372a4d8..ef4d10e66b 100644
--- a/src/components/structures/MessagePanel.js
+++ b/src/components/structures/MessagePanel.js
@@ -321,7 +321,7 @@ module.exports = React.createClass({
                 }
 
                 ret.push(
-                    <MemberEventListSummary events={summarisedEvents}>
+                    <MemberEventListSummary key={mxEv.getId()} events={summarisedEvents}>
                         {eventTiles}
                     </MemberEventListSummary>
                 );