diff --git a/api/src/Mail.php b/api/src/Mail.php
index 2860d3cecb..5f2cd94a84 100644
--- a/api/src/Mail.php
+++ b/api/src/Mail.php
@@ -6448,7 +6448,7 @@ class Mail
 	static function clean_subject_for_filename($filename)
 	{
 		static $filter_pattern = '$[\f\n\t\x0b\:*#?<>%"\|/\x{10000}-\x{10FFFF}\\\\]$u';
-		$file = trim(preg_replace($filter_pattern, ' ', $filename));
+		$file = substr(trim(preg_replace($filter_pattern, ' ', $filename)), 0, 200);
 		if (empty($file)) $file = lang('empty');
 		return $file;
 	}