diff --git a/mail_preview_base/static/src/js/preview.js b/mail_preview_base/static/src/js/preview.js
index 713629893..c488fde8a 100644
--- a/mail_preview_base/static/src/js/preview.js
+++ b/mail_preview_base/static/src/js/preview.js
@@ -141,6 +141,7 @@ odoo.define("mail_preview_base.preview", function (require) {
     return {
         FieldPreviewViewer: FieldPreviewViewer,
         FieldPreviewBinary: FieldPreviewBinary,
+        DocumentViewer: DocumentViewer,
     };
 
 });