diff --git a/eclass/elisp-common.eclass b/eclass/elisp-common.eclass
index 8b4c1be99bb7b..ad9d3c7e60c6d 100644
--- a/eclass/elisp-common.eclass
+++ b/eclass/elisp-common.eclass
@@ -322,7 +322,7 @@ elisp-make-autoload-file() {
 	ebegin "Generating autoload file for GNU Emacs"
 
 	cat >"${f}" <<-EOF
-	;;; ${f##*/} --- autoloads for ${PN}
+	;;; ${f##*/} --- autoloads for ${PN}  -*-lexical-binding:t-*-
 
 	;;; Commentary:
 	;; Automatically generated by elisp-common.eclass
@@ -705,7 +705,7 @@ elisp-site-regen() {
 	done
 
 	cat <<-EOF >"${T}"/site-gentoo.el || ret=$?
-	;;; site-gentoo.el --- site initialisation for Gentoo-installed packages
+	;;; site-gentoo.el --- Gentoo site initialisation  -*-lexical-binding:t-*-
 
 	;;; Commentary:
 	;; Automatically generated by elisp-common.eclass