diff --git a/snappymail/v/0.0.0/app/libraries/snappymail/tar.php b/snappymail/v/0.0.0/app/libraries/snappymail/tar.php
index 8ede5737d..e1c5cf355 100644
--- a/snappymail/v/0.0.0/app/libraries/snappymail/tar.php
+++ b/snappymail/v/0.0.0/app/libraries/snappymail/tar.php
@@ -29,7 +29,7 @@ class TAR
 		}
 
 		if ($files) {
-			$files = '/^(' . \implode('|', \array_map('preg_quote', \is_array($files) ? $files : [$files])) . ')/u';
+			$files = '/^(' . \implode('|', \array_map(fn($x): string => preg_quote($x, '/'), \is_array($files) ? $files : [$files])) . ')/u';
 		}
 
 		\clearstatcache(true);