diff --git a/qml/form/RoomListForm.qml b/qml/form/RoomListForm.qml
index 398074f..7708b2f 100644
--- a/qml/form/RoomListForm.qml
+++ b/qml/form/RoomListForm.qml
@@ -73,7 +73,7 @@ Item {
                 RoleSorter { roleName: "category" },
                 RoleSorter {
                     enabled: MSettings.rearrangeByActivity
-                    roleName: "unreadCount"
+                    roleName: "lastActiveTime"
                     sortOrder: Qt.DescendingOrder
                 },
                 StringSorter { roleName: "name" }
diff --git a/src/roomlistmodel.cpp b/src/roomlistmodel.cpp
index fc06720..5d7d240 100644
--- a/src/roomlistmodel.cpp
+++ b/src/roomlistmodel.cpp
@@ -163,6 +163,7 @@ QVariant RoomListModel::data(const QModelIndex& index, int role) const {
   if (role == UnreadCountRole) return room->unreadCount();
   if (role == HighlightCountRole) return room->highlightCount();
   if (role == LastEventRole) return room->lastEvent();
+  if (role == LastActiveTimeRole) return room->lastActiveTime();
   if (role == CurrentRoomRole) return QVariant::fromValue(room);
   return QVariant();
 }
@@ -196,6 +197,7 @@ QHash<int, QByteArray> RoomListModel::roleNames() const {
   roles[UnreadCountRole] = "unreadCount";
   roles[HighlightCountRole] = "highlightCount";
   roles[LastEventRole] = "lastEvent";
+  roles[LastActiveTimeRole] = "lastActiveTime";
   roles[CurrentRoomRole] = "currentRoom";
   return roles;
 }
diff --git a/src/roomlistmodel.h b/src/roomlistmodel.h
index 68fabd5..418a8fb 100644
--- a/src/roomlistmodel.h
+++ b/src/roomlistmodel.h
@@ -3,8 +3,8 @@
 
 #include "connection.h"
 #include "events/roomevent.h"
-#include "spectralroom.h"
 #include "room.h"
+#include "spectralroom.h"
 
 #include <QtCore/QAbstractListModel>
 
@@ -37,6 +37,7 @@ class RoomListModel : public QAbstractListModel {
     UnreadCountRole,
     HighlightCountRole,
     LastEventRole,
+    LastActiveTimeRole,
     CurrentRoomRole,
   };
 
diff --git a/src/spectralroom.cpp b/src/spectralroom.cpp
index 037eb9e..24cf1ac 100644
--- a/src/spectralroom.cpp
+++ b/src/spectralroom.cpp
@@ -140,3 +140,8 @@ void SpectralRoom::sendReply(QString userId, QString eventId,
            "</blockquote></mx-reply>" + sendContent}};
   postJson("m.room.message", json);
 }
+
+QDateTime SpectralRoom::lastActiveTime() {
+    if (timelineSize() == 0) return QDateTime();
+    return messageEvents().rbegin()->get()->timestamp();
+}
diff --git a/src/spectralroom.h b/src/spectralroom.h
index da41e0f..be0ed8d 100644
--- a/src/spectralroom.h
+++ b/src/spectralroom.h
@@ -35,6 +35,8 @@ class SpectralRoom : public Room {
   QString lastEvent();
   bool isEventHighlighted(const QMatrixClient::RoomEvent* e) const;
 
+  QDateTime lastActiveTime();
+
  private:
   QString m_cachedInput;
   QSet<const QMatrixClient::RoomEvent*> highlights;
@@ -59,7 +61,8 @@ class SpectralRoom : public Room {
   void acceptInvitation();
   void forget();
   void sendTypingNotification(bool isTyping);
-  void sendReply(QString userId, QString eventId, QString replyContent, QString sendContent);
+  void sendReply(QString userId, QString eventId, QString replyContent,
+                 QString sendContent);
 };
 
 #endif  // SpectralRoom_H