diff --git a/lib/private/Sharing/SharingBackend.php b/lib/private/Sharing/SharingBackend.php
index e8cd285e50389..f0331cb6fb7be 100644
--- a/lib/private/Sharing/SharingBackend.php
+++ b/lib/private/Sharing/SharingBackend.php
@@ -991,7 +991,7 @@ private function list(
 
 			$result = $qb->executeQuery();
 			foreach ($result->fetchAll() as $row) {
-				$id = (int)$row['share_id'];
+				$id = (string)$row['share_id'];
 
 				/** @var class-string<ISharePermissionType> $permissionTypeClass */
 				$permissionTypeClass = $this->classMapper->getClassName((int)$row['permission_class_id']);