diff --git a/lisp/language/viet-util.el b/lisp/language/viet-util.el
index 19b182c4382..fe9ea066d6f 100644
--- a/lisp/language/viet-util.el
+++ b/lisp/language/viet-util.el
@@ -35,6 +35,7 @@
 
 ;;; Code:
 
+;;;###autoload
 (defun setup-vietnamese-environment ()
   "Setup multilingual environment (MULE) for Vietnamese VISCII users."
   (interactive)