diff --git a/lisp/helper.el b/lisp/helper.el
index aa35c2b..c0b2889 100644
--- a/lisp/helper.el
+++ b/lisp/helper.el
@@ -1,3 +1,4 @@
+;; -*- lexical-binding: nil; -*-
 (defun roswell-configdir ()
   (substring (shell-command-to-string "ros roswell-internal-use version confdir") 0 -1))