diff --git a/extensions/mentions/extend.php b/extensions/mentions/extend.php
index 52ee377176..6f59fd0b20 100644
--- a/extensions/mentions/extend.php
+++ b/extensions/mentions/extend.php
@@ -78,15 +78,17 @@
         ->addInclude(['posts.mentionedBy', 'posts.mentionedBy.user', 'posts.mentionedBy.discussion'])
         ->load([
             'posts.mentionsUsers', 'posts.mentionsPosts', 'posts.mentionsPosts.user',
-            'posts.mentionsGroups'
+            'posts.mentionsPosts.discussion', 'posts.mentionsGroups'
         ])
         ->loadWhere('posts.mentionedBy', [LoadMentionedByRelationship::class, 'mutateRelation'])
         ->prepareDataForSerialization([LoadMentionedByRelationship::class, 'countRelation']),
 
     (new Extend\ApiController(Controller\ListDiscussionsController::class))
         ->load([
-            'firstPost.mentionsUsers', 'firstPost.mentionsPosts', 'firstPost.mentionsPosts.user', 'firstPost.mentionsGroups',
-            'lastPost.mentionsUsers', 'lastPost.mentionsPosts', 'lastPost.mentionsPosts.user', 'lastPost.mentionsGroups',
+            'firstPost.mentionsUsers', 'firstPost.mentionsPosts',
+            'firstPost.mentionsPosts.user', 'firstPost.mentionsPosts.discussion', 'firstPost.mentionsGroups',
+            'lastPost.mentionsUsers', 'lastPost.mentionsPosts',
+            'lastPost.mentionsPosts.user', 'lastPost.mentionsPosts.discussion', 'lastPost.mentionsGroups',
         ]),
 
     (new Extend\ApiController(Controller\ShowPostController::class))
@@ -98,7 +100,7 @@
 
     (new Extend\ApiController(Controller\ListPostsController::class))
         ->addInclude(['mentionedBy', 'mentionedBy.user', 'mentionedBy.discussion'])
-        ->load(['mentionsUsers', 'mentionsPosts', 'mentionsPosts.user', 'mentionsGroups'])
+        ->load(['mentionsUsers', 'mentionsPosts', 'mentionsPosts.user', 'mentionsPosts.discussion', 'mentionsGroups'])
         ->loadWhere('mentionedBy', [LoadMentionedByRelationship::class, 'mutateRelation'])
         ->prepareDataForSerialization([LoadMentionedByRelationship::class, 'countRelation']),
 
diff --git a/extensions/mentions/src/Api/LoadMentionedByRelationship.php b/extensions/mentions/src/Api/LoadMentionedByRelationship.php
index 14fc824306..7af49a7fd5 100644
--- a/extensions/mentions/src/Api/LoadMentionedByRelationship.php
+++ b/extensions/mentions/src/Api/LoadMentionedByRelationship.php
@@ -29,7 +29,7 @@ public static function mutateRelation(BelongsToMany $query, ServerRequestInterfa
         $actor = RequestUtil::getActor($request);
 
         return $query
-            ->with(['mentionsPosts', 'mentionsPosts.user', 'mentionsUsers'])
+            ->with(['mentionsPosts', 'mentionsPosts.user', 'mentionsPosts.discussion', 'mentionsUsers'])
             ->whereVisibleTo($actor)
             ->oldest()
             // Limiting a relationship results is only possible because
diff --git a/extensions/mentions/src/FilterVisiblePosts.php b/extensions/mentions/src/FilterVisiblePosts.php
deleted file mode 100755
index e69de29bb2..0000000000
diff --git a/extensions/mentions/src/Formatter/FormatPostMentions.php b/extensions/mentions/src/Formatter/FormatPostMentions.php
index 45a485e57a..2f745bfcce 100644
--- a/extensions/mentions/src/Formatter/FormatPostMentions.php
+++ b/extensions/mentions/src/Formatter/FormatPostMentions.php
@@ -9,6 +9,9 @@
 
 namespace Flarum\Mentions\Formatter;
 
+use Flarum\Discussion\Discussion;
+use Flarum\Http\SlugManager;
+use Flarum\Post\CommentPost;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use s9e\TextFormatter\Renderer;
 use s9e\TextFormatter\Utils;
@@ -21,9 +24,15 @@ class FormatPostMentions
      */
     private $translator;
 
-    public function __construct(TranslatorInterface $translator)
+    /**
+     * @var SlugManager
+     */
+    private $slugManager;
+
+    public function __construct(TranslatorInterface $translator, SlugManager $slugManager)
     {
         $this->translator = $translator;
+        $this->slugManager = $slugManager;
     }
 
     /**
@@ -56,6 +65,12 @@ public function __invoke(Renderer $renderer, $context, $xml, Request $request =
                 $attributes['displayname'] = $this->translator->trans('core.lib.username.deleted_text');
             }
 
+            if ($post) {
+                $attributes['discussionid'] = $this->slugManager
+                    ->forResource(Discussion::class)
+                    ->toSlug($post->discussion);
+            }
+
             return $attributes;
         });
     }