diff --git a/lib/Mime/Viewer/Appledouble.php b/lib/Mime/Viewer/Appledouble.php
index 44e20e555..a323885d5 100644
--- a/lib/Mime/Viewer/Appledouble.php
+++ b/lib/Mime/Viewer/Appledouble.php
@@ -97,7 +97,7 @@ protected function _IMPrender($inline)
         $data_name = $this->getConfigParam('imp_contents')->getPartName($data_part);
 
         $status = new IMP_Mime_Status($this->_mimepart, [
-            sprintf(_('This message contains a Macintosh file (named "%s").'), $data_name),
+            sprintf(_('This message contains a Macintosh file (named "%s").'), htmlspecialchars($data_name, ENT_QUOTES, $this->getConfigParam('charset'))),
             $this->getConfigParam('imp_contents')->linkViewJS(
                 $applefile_part,
                 'download_attach',