diff --git a/lib/private/Files/Storage/Wrapper/PermissionsMask.php b/lib/private/Files/Storage/Wrapper/PermissionsMask.php
index d66390dad4..170929aa9f 100644
--- a/lib/private/Files/Storage/Wrapper/PermissionsMask.php
+++ b/lib/private/Files/Storage/Wrapper/PermissionsMask.php
@@ -149,6 +149,9 @@ class PermissionsMask extends Wrapper {
 	}
 
 	public function getScanner($path = '', $storage = null) {
-		return parent::getScanner($path, $this->storage);
+		if (!$storage) {
+			$storage = $this->storage;
+		}
+		return parent::getScanner($path, $storage);
 	}
 }