diff --git a/tests/ACL/ACLManagerTest.php b/tests/ACL/ACLManagerTest.php
index 1b0ea88dc..2ba8f9b46 100644
--- a/tests/ACL/ACLManagerTest.php
+++ b/tests/ACL/ACLManagerTest.php
@@ -39,6 +39,8 @@ class ACLManagerTest extends TestCase {
 	private $ruleManager;
 	/** @var TrashManager */
 	private $trashManager;
+	/** @var LoggerInterface */
+	private $logger,
 	/** @var IUser */
 	private $user;
 	/** @var ACLManager */
@@ -54,6 +56,7 @@ protected function setUp(): void {
 		$this->user = $this->createMock(IUser::class);
 		$this->ruleManager = $this->createMock(RuleManager::class);
 		$this->trashManager = $this->createMock(TrashManager::class);
+		$this->logger = $this->createMock(LoggerInterface::class);
 		$this->aclManager = $this->getAclManager();
 		$this->dummyMapping = $this->createMapping('dummy');