diff --git a/src/Legacy/Attach.php b/src/Legacy/Attach.php
index b165a3173..6e817000e 100644
--- a/src/Legacy/Attach.php
+++ b/src/Legacy/Attach.php
@@ -847,7 +847,7 @@ class Attach
                     $this->attach_filename = preg_replace('#([\xC2\xC3])([\x80-\xBF])#', 'chr(ord(\'$1\')<<6&0xC0|ord(\'$2\')&0x3F)', $this->attach_filename);
                     $this->attach_filename = rawurlencode($this->attach_filename);
                     $this->attach_filename = preg_replace("/(%[0-9A-F]{1,2})/i", '', $this->attach_filename);
-                    $this->attach_filename = trim($this->attach_filename . time());
+                    $this->attach_filename = trim($this->attach_filename . '_' .make_rand_str(13));
                 }
                 $this->attach_filename = str_replace(['&amp;', '&', ' '], '_', $this->attach_filename);
                 $this->attach_filename = str_replace('php', '_php_', $this->attach_filename);