diff --git a/src/Api/Controller/ShowDiscussionController.php b/src/Api/Controller/ShowDiscussionController.php
index cda6b4546..c2bcacc44 100644
--- a/src/Api/Controller/ShowDiscussionController.php
+++ b/src/Api/Controller/ShowDiscussionController.php
@@ -24,6 +24,11 @@ class ShowDiscussionController extends AbstractResourceController
      */
     protected $discussions;
 
+    /**
+     * @var PostRepository
+     */
+    protected $posts;
+
     /**
      * {@inheritdoc}
      */