diff --git a/src/components/NewActivitiesNotification.js b/src/components/NewActivitiesNotification.js
index 256de2f..dc20607 100644
--- a/src/components/NewActivitiesNotification.js
+++ b/src/components/NewActivitiesNotification.js
@@ -78,7 +78,7 @@ class NewActivitiesNotification extends React.Component {
 
 NewActivitiesNotification.propTypes = {
   adds: PropTypes.arrayOf(PropTypes.object),
-  deletes: PropTypes.arrayOf(PropTypes.object),
+  deletes: PropTypes.arrayOf(PropTypes.string),
   labelSingular: PropTypes.string,
   labelPlural: PropTypes.string,
   /**