diff --git a/systemd-company.el b/systemd-company.el
index 27ae4cd..8bb4153 100644
--- a/systemd-company.el
+++ b/systemd-company.el
@@ -1,4 +1,4 @@
-;;; systemd-company.el --- company backend for systemd unit directives
+;;; systemd-company.el --- company backend for systemd unit directives -*- lexical-binding: t -*-
 
 ;; Copyright (C) 2015  Mark Oteiza <mvoteiza@udel.edu>
 
diff --git a/systemd.el b/systemd.el
index 4959c25..00221d5 100644
--- a/systemd.el
+++ b/systemd.el
@@ -1,4 +1,4 @@
-;;; systemd.el --- Major mode for editing systemd units
+;;; systemd.el --- Major mode for editing systemd units -*- lexical-binding: t -*-
 
 ;; Copyright (C) 2014-2015  Mark Oteiza <mvoteiza@udel.edu>