diff --git a/tests/lib/TestCase.php b/tests/lib/TestCase.php
index 1782bd359ba..e8fd7ad220f 100644
--- a/tests/lib/TestCase.php
+++ b/tests/lib/TestCase.php
@@ -344,6 +344,8 @@ abstract class TestCase extends \PHPUnit\Framework\TestCase {
 
 		unset(\OC::$server[\OC\Files\AppData\Factory::class]);
 		unset(\OC::$server[\OC\App\AppStore\Fetcher\AppFetcher::class]);
+		unset(\OC::$server[\OC\Installer::class]);
+		unset(\OC::$server[\OC\Updater::class]);
 
 		/** @var SetupManager $setupManager */
 		$setupManager = Server::get(SetupManager::class);