diff --git a/lisp/scroll-lock.el b/lisp/scroll-lock.el
index 3a6d9d36429..f20ea1bcc87 100644
--- a/lisp/scroll-lock.el
+++ b/lisp/scroll-lock.el
@@ -1,4 +1,4 @@
-;;; scroll-lock.el --- Scroll lock scrolling.
+;;; scroll-lock.el --- Scroll lock scrolling.  -*- lexical-binding:t -*-
 
 ;; Copyright (C) 2005-2020 Free Software Foundation, Inc.