diff --git a/apps/files_sharing/lib/External/Manager.php b/apps/files_sharing/lib/External/Manager.php
index e59c98b07c..e4b28804fc 100644
--- a/apps/files_sharing/lib/External/Manager.php
+++ b/apps/files_sharing/lib/External/Manager.php
@@ -131,7 +131,7 @@ class Manager {
 	 * @return Mount|null
 	 * @throws \Doctrine\DBAL\DBALException
 	 */
-	public function addShare($remote, $token, $password, $name, $owner, $shareType, $accepted=false, $user = null, $remoteId = -1, $parent = -1) {
+	public function addShare($remote, $token, $password, $name, $owner, $shareType, $accepted = false, $user = null, $remoteId = '', $parent = -1) {
 		$user = $user ? $user : $this->uid;
 		$accepted = $accepted ? IShare::STATUS_ACCEPTED : IShare::STATUS_PENDING;
 		$name = Filesystem::normalizePath('/' . $name);