diff --git a/framework/core/src/Api/Controller/UpdateDiscussionController.php b/framework/core/src/Api/Controller/UpdateDiscussionController.php
index 86b0f8152..68e196e21 100644
--- a/framework/core/src/Api/Controller/UpdateDiscussionController.php
+++ b/framework/core/src/Api/Controller/UpdateDiscussionController.php
@@ -64,7 +64,7 @@ class UpdateDiscussionController extends AbstractShowController
 
         if ($posts = $discussion->getModifiedPosts()) {
             $posts = (new Collection($posts))->load('discussion', 'user');
-            $discussionPosts = $discussion->posts()->whereVisibleTo($actor)->orderBy('time')->pluck('id')->all();
+            $discussionPosts = $discussion->posts()->whereVisibleTo($actor)->oldest()->pluck('id')->all();
 
             foreach ($discussionPosts as &$id) {
                 foreach ($posts as $post) {
diff --git a/framework/core/src/Discussion/Discussion.php b/framework/core/src/Discussion/Discussion.php
index d9feb4b6c..982bcccb3 100644
--- a/framework/core/src/Discussion/Discussion.php
+++ b/framework/core/src/Discussion/Discussion.php
@@ -223,7 +223,7 @@ class Discussion extends AbstractModel
     public function refreshLastPost()
     {
         /** @var Post $lastPost */
-        if ($lastPost = $this->comments()->latest('created_at')->first()) {
+        if ($lastPost = $this->comments()->latest()->first()) {
             $this->setLastPost($lastPost);
         }
 
@@ -269,7 +269,7 @@ class Discussion extends AbstractModel
      */
     public function mergePost(MergeableInterface $post)
     {
-        $lastPost = $this->posts()->latest('created_at')->first();
+        $lastPost = $this->posts()->latest()->first();
 
         $post = $post->saveAfter($lastPost);
 
diff --git a/framework/core/src/Notification/NotificationRepository.php b/framework/core/src/Notification/NotificationRepository.php
index 629fe8792..726206cb3 100644
--- a/framework/core/src/Notification/NotificationRepository.php
+++ b/framework/core/src/Notification/NotificationRepository.php
@@ -41,7 +41,7 @@ class NotificationRepository
         return Notification::select('notifications.*', app('flarum.db')->raw('p.unread_count'))
             ->mergeBindings($primaries->getQuery())
             ->join(app('flarum.db')->raw('('.$primaries->toSql().') p'), 'notifications.id', '=', app('flarum.db')->raw('p.id'))
-            ->latest('created_at')
+            ->latest()
             ->get();
     }