diff --git a/lib/files/storage/mappedlocal.php b/lib/files/storage/mappedlocal.php
index cf5d9b3ef4..fbf1b4ebf9 100644
--- a/lib/files/storage/mappedlocal.php
+++ b/lib/files/storage/mappedlocal.php
@@ -65,7 +65,7 @@ class MappedLocal extends \OC\Files\Storage\Common{
 
 		$logicalPath = $this->mapper->physicalToLogic($physicalPath);
 		$dh = opendir($physicalPath);
-		while ($file = readdir($dh)) {
+		while (($file = readdir($dh)) !== false) {
 			if ($file === '.' or $file === '..') {
 				continue;
 			}