diff --git a/lisp/vt-control.el b/lisp/vt-control.el
index fc3a514f921..d4c14197bdc 100644
--- a/lisp/vt-control.el
+++ b/lisp/vt-control.el
@@ -1,4 +1,4 @@
-;;; vt-control.el --- Common VTxxx control functions
+;;; vt-control.el --- Common VTxxx control functions  -*- lexical-binding:t -*-
 
 ;; Copyright (C) 1993-1994, 2001-2020 Free Software Foundation, Inc.