diff --git a/apps/files_external/tests/Service/UserGlobalStoragesServiceTest.php b/apps/files_external/tests/Service/UserGlobalStoragesServiceTest.php
index b622fd5221d471e1d699ef065d4e0ab242dc244b..88928d1a21737917abf97a241059b8d90273b36c 100644
--- a/apps/files_external/tests/Service/UserGlobalStoragesServiceTest.php
+++ b/apps/files_external/tests/Service/UserGlobalStoragesServiceTest.php
@@ -64,7 +64,7 @@ class UserGlobalStoragesServiceTest extends GlobalStoragesServiceTest {
 
 		$this->globalStoragesService = $this->service;
 
-		$this->user = $this->createMock(IUser::class);
+		$this->user = new \OC\User\User(self::USER_ID, null, \OC::$server->getEventDispatcher());
 		/** @var \OCP\IUserSession|\PHPUnit_Framework_MockObject_MockObject $userSession */
 		$userSession = $this->createMock(IUserSession::class);
 		$userSession