diff --git a/src/models/room.js b/src/models/room.js
index 94abbf689..fd4627768 100644
--- a/src/models/room.js
+++ b/src/models/room.js
@@ -379,7 +379,7 @@ Room.prototype.setUnreadNotificationCount = function(type, count) {
 };
 
 Room.prototype.setSummary = function(summary) {
-    const heros = summary["m.heros"];
+    const heros = summary["m.heroes"];
     const count = summary["m.joined_member_count"];
     if (Number.isInteger(count)) {
         this.currentState.setJoinedMemberCount(count);
diff --git a/src/sync-accumulator.js b/src/sync-accumulator.js
index add58adb1..3ff71af77 100644
--- a/src/sync-accumulator.js
+++ b/src/sync-accumulator.js
@@ -63,7 +63,7 @@ class SyncAccumulator {
             //       { event: $event, token: null|token },
             //       ...
             //    ],
-            //    _summary: { m.heros: [ $user_id ], m.joined_member_count: $count }
+            //    _summary: { m.heroes: [ $user_id ], m.joined_member_count: $count }
             //    _accountData: { $event_type: json },
             //    _unreadNotifications: { ... unread_notifications JSON ... },
             //    _readReceipts: { $user_id: { data: $json, eventId: $event_id }}
diff --git a/src/sync.js b/src/sync.js
index 8e348b6f3..c3c8970e8 100644
--- a/src/sync.js
+++ b/src/sync.js
@@ -823,7 +823,7 @@ SyncApi.prototype._processSyncResponse = async function(
     //          state: { events: [] },
     //          timeline: { events: [], prev_batch: $token, limited: true },
     //          ephemeral: { events: [] },
-    //          summary: { m.heros: [ $userId ], m.joined_member_count: $count }
+    //          summary: { m.heroes: [ $userId ], m.joined_member_count: $count }
     //          account_data: { events: [] },
     //          unread_notifications: {
     //              highlight_count: 0,