diff --git a/extensions/mentions/tests/integration/api/ListPostsTest.php b/extensions/mentions/tests/integration/api/ListPostsTest.php
index 5ee3e7e43..b3fd0b551 100644
--- a/extensions/mentions/tests/integration/api/ListPostsTest.php
+++ b/extensions/mentions/tests/integration/api/ListPostsTest.php
@@ -14,7 +14,7 @@ use Flarum\Testing\integration\RetrievesAuthorizedUsers;
 use Flarum\Testing\integration\TestCase;
 use Illuminate\Support\Arr;
 
-class ListTest extends TestCase
+class ListPostsTest extends TestCase
 {
     use RetrievesAuthorizedUsers;
 
@@ -85,4 +85,26 @@ class ListTest extends TestCase
         $ids = Arr::pluck($data, 'id');
         $this->assertEqualsCanonicalizing(['4'], $ids, 'IDs do not match');
     }
+
+    /**
+     * @test
+     */
+    public function mentioned_filter_works_with_sort()
+    {
+        $response = $this->send(
+            $this->request('GET', '/api/posts')
+                ->withQueryParams([
+                    'filter' => ['mentioned' => 1],
+                    'sort' => '-createdAt'
+                ])
+        );
+
+        $data = json_decode($response->getBody()->getContents(), true)['data'];
+
+        $this->assertEquals(200, $response->getStatusCode());
+
+        // Order-independent comparison
+        $ids = Arr::pluck($data, 'id');
+        $this->assertEqualsCanonicalizing(['3', '2'], $ids, 'IDs do not match');
+    }
 }
diff --git a/framework/core/src/Api/Controller/ListPostsController.php b/framework/core/src/Api/Controller/ListPostsController.php
index 0c9ef05a9..f38cd71ab 100644
--- a/framework/core/src/Api/Controller/ListPostsController.php
+++ b/framework/core/src/Api/Controller/ListPostsController.php
@@ -113,6 +113,20 @@ class ListPostsController extends AbstractListController
         return $results;
     }
 
+    /**
+     * @link https://github.com/flarum/framework/pull/3506
+     */
+    protected function extractSort(ServerRequestInterface $request)
+    {
+        $sort = [];
+
+        foreach ((parent::extractSort($request) ?: []) as $field => $direction) {
+            $sort["posts.$field"] = $direction;
+        }
+
+        return $sort;
+    }
+
     /**
      * {@inheritdoc}
      */