diff --git a/lisp/time.el b/lisp/time.el
index 440f8ac9c6b..63773d42048 100644
--- a/lisp/time.el
+++ b/lisp/time.el
@@ -1,4 +1,4 @@
-;;; time.el --- display time, load and mail indicator in mode line of Emacs
+;;; time.el --- display time, load and mail indicator in mode line of Emacs  -*- lexical-binding: t -*-
 
 ;; Copyright (C) 1985-1987, 1993-1994, 1996, 2000-2020 Free Software
 ;; Foundation, Inc.