diff --git a/lib/private/Files/Config/CachedMountFileInfo.php b/lib/private/Files/Config/CachedMountFileInfo.php
index 7bae52bb65..ae34431f8b 100644
--- a/lib/private/Files/Config/CachedMountFileInfo.php
+++ b/lib/private/Files/Config/CachedMountFileInfo.php
@@ -31,7 +31,7 @@ class CachedMountFileInfo extends CachedMountInfo implements ICachedMountFileInf
 	/** @var string */
 	private $internalPath;
 
-	public function __construct(IUser $user, $storageId, $rootId, $mountPoint, $mountId = null, $rootInternalPath = '', $internalPath) {
+	public function __construct(IUser $user, int $storageId, int $rootId, string $mountPoint, ?int $mountId, string $rootInternalPath, string $internalPath) {
 		parent::__construct($user, $storageId, $rootId, $mountPoint, $mountId, $rootInternalPath);
 		$this->internalPath = $internalPath;
 	}
diff --git a/lib/private/Files/Config/CachedMountInfo.php b/lib/private/Files/Config/CachedMountInfo.php
index 38919020ee..18011d5e3f 100644
--- a/lib/private/Files/Config/CachedMountInfo.php
+++ b/lib/private/Files/Config/CachedMountInfo.php
@@ -69,7 +69,7 @@ class CachedMountInfo implements ICachedMountInfo {
 	 * @param int|null $mountId
 	 * @param string $rootInternalPath
 	 */
-	public function __construct(IUser $user, $storageId, $rootId, $mountPoint, $mountId = null, $rootInternalPath = '') {
+	public function __construct(IUser $user, int $storageId, int $rootId, string $mountPoint, ?int $mountId, string $rootInternalPath) {
 		$this->user = $user;
 		$this->storageId = $storageId;
 		$this->rootId = $rootId;