diff --git a/src/components/views/elements/MemberEventListSummary.js b/src/components/views/elements/MemberEventListSummary.js
index 7811044fda..27c50fe97c 100644
--- a/src/components/views/elements/MemberEventListSummary.js
+++ b/src/components/views/elements/MemberEventListSummary.js
@@ -145,9 +145,13 @@ module.exports = React.createClass({
     },
 
     shouldComponentUpdate: function(nextProps, nextState) {
+        // Update if
+        //  - The number of summarised events has changed
+        //  - or if the summary is currently expanded
+        //  - or if the summary is about to toggle to become collapsed
         return (
             nextProps.events.length !== this.props.events.length ||
-            nextState.expanded !== this.state.expanded
+            this.state.expanded || nextState.expanded
         );
     },