diff --git a/extensions/mentions/extend.php b/extensions/mentions/extend.php
index 5f52d4798..c4f388bdf 100644
--- a/extensions/mentions/extend.php
+++ b/extensions/mentions/extend.php
@@ -7,15 +7,12 @@
  * LICENSE file that was distributed with this source code.
  */
 
+namespace Flarum\Mentions;
+
 use Flarum\Api\Controller;
 use Flarum\Api\Serializer\BasicPostSerializer;
 use Flarum\Api\Serializer\PostSerializer;
-use Flarum\Event\ConfigurePostsQuery;
 use Flarum\Extend;
-use Flarum\Mentions\ConfigureMentions;
-use Flarum\Mentions\FilterVisiblePosts;
-use Flarum\Mentions\Formatter;
-use Flarum\Mentions\Listener;
 use Flarum\Mentions\Notification\PostMentionedBlueprint;
 use Flarum\Mentions\Notification\UserMentionedBlueprint;
 use Flarum\Post\Event\Deleted;
@@ -23,6 +20,7 @@ use Flarum\Post\Event\Hidden;
 use Flarum\Post\Event\Posted;
 use Flarum\Post\Event\Restored;
 use Flarum\Post\Event\Revised;
+use Flarum\Post\Filter\PostFilterer;
 use Flarum\Post\Post;
 use Flarum\User\User;
 
@@ -83,6 +81,8 @@ return [
         ->listen(Restored::class, Listener\UpdateMentionsMetadataWhenVisible::class)
         ->listen(Revised::class, Listener\UpdateMentionsMetadataWhenVisible::class)
         ->listen(Hidden::class, Listener\UpdateMentionsMetadataWhenInvisible::class)
-        ->listen(Deleted::class, Listener\UpdateMentionsMetadataWhenInvisible::class)
-        ->listen(ConfigurePostsQuery::class, Listener\AddFilterByMentions::class),
+        ->listen(Deleted::class, Listener\UpdateMentionsMetadataWhenInvisible::class),
+
+    (new Extend\Filter(PostFilterer::class))
+        ->addFilter(Filter\MentionedFilter::class),
 ];
diff --git a/extensions/mentions/src/Filter/MentionedFilter.php b/extensions/mentions/src/Filter/MentionedFilter.php
new file mode 100644
index 000000000..de7edd58b
--- /dev/null
+++ b/extensions/mentions/src/Filter/MentionedFilter.php
@@ -0,0 +1,31 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Flarum\Mentions\Filter;
+
+use Flarum\Filter\FilterInterface;
+use Flarum\Filter\FilterState;
+
+class MentionedFilter implements FilterInterface
+{
+    public function getFilterKey(): string
+    {
+        return 'mentioned';
+    }
+
+    public function filter(FilterState $filterState, string $filterValue, bool $negate)
+    {
+        $mentionedId = trim($filterValue, '"');
+
+        $filterState
+            ->getQuery()
+            ->join('post_mentions_user', 'posts.id', '=', 'post_mentions_user.post_id')
+            ->where('post_mentions_user.mentions_user_id', $negate ? '!=' : '=', $mentionedId);
+    }
+}
diff --git a/extensions/mentions/src/Listener/AddFilterByMentions.php b/extensions/mentions/src/Listener/AddFilterByMentions.php
deleted file mode 100755
index e25106d20..000000000
--- a/extensions/mentions/src/Listener/AddFilterByMentions.php
+++ /dev/null
@@ -1,24 +0,0 @@
-<?php
-
-/*
- * This file is part of Flarum.
- *
- * For detailed copyright and license information, please view the
- * LICENSE file that was distributed with this source code.
- */
-
-namespace Flarum\Mentions\Listener;
-
-use Flarum\Event\ConfigurePostsQuery;
-use Illuminate\Support\Arr;
-
-class AddFilterByMentions
-{
-    public function handle(ConfigurePostsQuery $event)
-    {
-        if ($mentionedId = Arr::get($event->filter, 'mentioned')) {
-            $event->query->join('post_mentions_user', 'posts.id', '=', 'post_mentions_user.post_id')
-                ->where('post_mentions_user.mentions_user_id', '=', $mentionedId);
-        }
-    }
-}
diff --git a/extensions/mentions/tests/integration/api/ListPostsTest.php b/extensions/mentions/tests/integration/api/ListPostsTest.php
new file mode 100644
index 000000000..5ee3e7e43
--- /dev/null
+++ b/extensions/mentions/tests/integration/api/ListPostsTest.php
@@ -0,0 +1,88 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Flarum\Tests\integration\api\discussions;
+
+use Carbon\Carbon;
+use Flarum\Testing\integration\RetrievesAuthorizedUsers;
+use Flarum\Testing\integration\TestCase;
+use Illuminate\Support\Arr;
+
+class ListTest extends TestCase
+{
+    use RetrievesAuthorizedUsers;
+
+    /**
+     * @inheritDoc
+     */
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->extension('flarum-mentions');
+
+        $this->prepareDatabase([
+            'discussions' => [
+                ['id' => 1, 'title' => __CLASS__, 'created_at' => Carbon::now(), 'user_id' => 1, 'first_post_id' => 1, 'comment_count' => 1],
+            ],
+            'posts' => [
+                ['id' => 1, 'discussion_id' => 1, 'created_at' => Carbon::now(), 'user_id' => 1, 'type' => 'comment', 'content' => '<t><p>text</p></t>'],
+                ['id' => 2, 'discussion_id' => 1, 'created_at' => Carbon::now(), 'user_id' => 2, 'type' => 'comment', 'content' => '<t><p>text</p></t>'],
+                ['id' => 3, 'discussion_id' => 1, 'created_at' => Carbon::now(), 'user_id' => 2, 'type' => 'comment', 'content' => '<t><p>text</p></t>'],
+                ['id' => 4, 'discussion_id' => 1, 'created_at' => Carbon::now(), 'user_id' => 1, 'type' => 'comment', 'content' => '<t><p>text</p></t>'],
+            ],
+            'post_mentions_user' => [
+                ['post_id' => 2, 'mentions_user_id' => 1],
+                ['post_id' => 3, 'mentions_user_id' => 1],
+                ['post_id' => 4, 'mentions_user_id' => 2]
+            ],
+            'users' => [
+                $this->normalUser(),
+            ]
+        ]);
+    }
+
+    /**
+     * @test
+     */
+    public function mentioned_filter_works()
+    {
+        $response = $this->send(
+            $this->request('GET', '/api/posts')
+                ->withQueryParams([
+                    'filter' => ['mentioned' => 1],
+                ])
+        );
+
+        $data = json_decode($response->getBody()->getContents(), true)['data'];
+
+        // Order-independent comparison
+        $ids = Arr::pluck($data, 'id');
+        $this->assertEqualsCanonicalizing(['2', '3'], $ids, 'IDs do not match');
+    }
+
+    /**
+     * @test
+     */
+    public function mentioned_filter_works_negated()
+    {
+        $response = $this->send(
+            $this->request('GET', '/api/posts')
+            ->withQueryParams([
+                'filter' => ['-mentioned' => 1],
+            ])
+        );
+
+        $data = json_decode($response->getBody()->getContents(), true)['data'];
+
+        // Order-independent comparison
+        $ids = Arr::pluck($data, 'id');
+        $this->assertEqualsCanonicalizing(['4'], $ids, 'IDs do not match');
+    }
+}