diff --git a/tests/lib/Comments/FakeManager.php b/tests/lib/Comments/FakeManager.php
index dfb8f21b64..840961fb90 100644
--- a/tests/lib/Comments/FakeManager.php
+++ b/tests/lib/Comments/FakeManager.php
@@ -1,6 +1,7 @@
 <?php
 
 namespace Test\Comments;
+use OCP\IUser;
 
 /**
  * Class FakeManager
@@ -44,4 +45,6 @@ class FakeManager implements \OCP\Comments\ICommentsManager {
 	public function registerDisplayNameResolver($type, \Closure $closure) {}
 
 	public function resolveDisplayName($type, $id) {}
+
+	public function getNumberOfUnreadCommentsForFolder($folderId, IUser $user) {}
 }