diff --git a/lisp/buff-menu.el b/lisp/buff-menu.el
index 9f618bcb7de..83d6bb6b0e9 100644
--- a/lisp/buff-menu.el
+++ b/lisp/buff-menu.el
@@ -1,4 +1,4 @@
-;;; buff-menu.el --- Interface for viewing and manipulating buffers
+;;; buff-menu.el --- Interface for viewing and manipulating buffers -*- lexical-binding: t -*-
 
 ;; Copyright (C) 1985-1987, 1993-1995, 2000-2017 Free Software
 ;; Foundation, Inc.