diff --git a/apps/files_sharing/lib/external/scanner.php b/apps/files_sharing/lib/external/scanner.php
index dd2c086e84c9a01293a0dae63175b1a5d44a4904..06708452c73be1daa105ecf02e7f622febcdfbc9 100644
--- a/apps/files_sharing/lib/external/scanner.php
+++ b/apps/files_sharing/lib/external/scanner.php
@@ -48,9 +48,11 @@ class Scanner extends \OC\Files\Cache\Scanner {
 	 * @param int $reuseExisting
 	 * @param int $parentId
 	 * @param array | null $cacheData existing data in the cache for the file to be scanned
+	 * @param bool $lock set to false to disable getting an additional read lock during scanning
+	 * @param array | null $cacheData existing data in the cache for the file to be scanned
 	 * @return array an array of metadata of the scanned file
 	 */
-	public function scanFile($file, $reuseExisting = 0, $parentId = -1, $cacheData = null) {
+	public function scanFile($file, $reuseExisting = 0, $parentId = -1, $cacheData = null, $lock = true) {
 		try {
 			return parent::scanFile($file, $reuseExisting);
 		} catch (ForbiddenException $e) {