diff --git a/lisp/url/url-vars.el b/lisp/url/url-vars.el
index e35823ab9af..f9dce2418f6 100644
--- a/lisp/url/url-vars.el
+++ b/lisp/url/url-vars.el
@@ -1,4 +1,4 @@
-;;; url-vars.el --- Variables for Uniform Resource Locator tool
+;;; url-vars.el --- Variables for Uniform Resource Locator tool  -*- lexical-binding:t -*-
 
 ;; Copyright (C) 1996-1999, 2001, 2004-2020 Free Software Foundation,
 ;; Inc.