diff --git a/app/lib/methods/helpers/mergeSubscriptionsRooms.js b/app/lib/methods/helpers/mergeSubscriptionsRooms.js
index 024a246d6..1bc3f18b2 100644
--- a/app/lib/methods/helpers/mergeSubscriptionsRooms.js
+++ b/app/lib/methods/helpers/mergeSubscriptionsRooms.js
@@ -15,9 +15,6 @@ export const merge = (subscription, room) => {
 	if (room) {
 		if (room._updatedAt) {
 			subscription.lastMessage = normalizeMessage(room.lastMessage);
-			const updatedAt = room?._updatedAt ? new Date(room._updatedAt) : null;
-			const lastMessageTs = subscription?.lastMessage?.ts ? new Date(subscription.lastMessage.ts) : null;
-			subscription.roomUpdatedAt = Math.max(updatedAt, lastMessageTs);
 			subscription.description = room.description;
 			subscription.topic = room.topic;
 			subscription.announcement = room.announcement;
@@ -28,6 +25,9 @@ export const merge = (subscription, room) => {
 			subscription.usernames = room.usernames;
 			subscription.uids = room.uids;
 		}
+		// https://github.com/RocketChat/Rocket.Chat/blob/develop/app/ui-sidenav/client/roomList.js#L180
+		const lastRoomUpdate = room.lm || subscription.ts || subscription._updatedAt;
+		subscription.roomUpdatedAt = subscription.lr ? Math.max(new Date(subscription.lr), new Date(lastRoomUpdate)) : lastRoomUpdate;
 		subscription.ro = room.ro;
 		subscription.broadcast = room.broadcast;
 		subscription.encrypted = room.encrypted;