diff --git a/sci-mathematics/twelf/twelf-1.7.1-r1.ebuild b/sci-mathematics/twelf/twelf-1.7.1-r1.ebuild
index 56b41fcc37e93..21d5f0f5a01ae 100644
--- a/sci-mathematics/twelf/twelf-1.7.1-r1.ebuild
+++ b/sci-mathematics/twelf/twelf-1.7.1-r1.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2018 Gentoo Foundation
+# Copyright 1999-2019 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI="6"
@@ -27,7 +27,7 @@ RDEPEND="
 		app-text/texi2html
 	)
 	emacs? (
-		virtual/emacs
+		>=app-editors/emacs-23.1:*
 	)"
 DEPEND="${RDEPEND}"
 
diff --git a/sci-mathematics/twelf/twelf-1.7.1.ebuild b/sci-mathematics/twelf/twelf-1.7.1.ebuild
index f9334067c3891..9506fdd825425 100644
--- a/sci-mathematics/twelf/twelf-1.7.1.ebuild
+++ b/sci-mathematics/twelf/twelf-1.7.1.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2018 Gentoo Foundation
+# Copyright 1999-2019 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI="5"
@@ -27,7 +27,7 @@ RDEPEND="
 		app-text/texi2html
 	)
 	emacs? (
-		virtual/emacs
+		>=app-editors/emacs-23.1:*
 	)"
 DEPEND="${RDEPEND}"