diff --git a/gnu/packages/emacs.scm b/gnu/packages/emacs.scm
index e22d716f7c..45e0635dea 100644
--- a/gnu/packages/emacs.scm
+++ b/gnu/packages/emacs.scm
@@ -8,7 +8,7 @@
 ;;; Copyright © 2016, 2017 Chris Marusich <cmmarusich@gmail.com>
 ;;; Copyright © 2015, 2016 Christopher Allan Webber <cwebber@dustycloud.org>
 ;;; Copyright © 2016 Adriano Peluso <catonano@gmail.com>
-;;; Copyright © 2016 Efraim Flashner <efraim@flashner.co.il>
+;;; Copyright © 2016, 2017 Efraim Flashner <efraim@flashner.co.il>
 ;;; Copyright © 2016 David Thompson <davet@gnu.org>
 ;;; Copyright © 2016 Matthew Jordan <matthewjordandevops@yandex.com>
 ;;; Copyright © 2016, 2017 Roel Janssen <roel@gnu.org>
@@ -1659,7 +1659,7 @@ (define-public emacs-undo-tree
               (method git-fetch)
               (uri (git-reference
                     (url "http://dr-qubit.org/git/undo-tree.git")
-                    (commit "release/0.6.6")))
+                    (commit (string-append "release/" version))))
               (file-name (string-append name "-" version "-checkout"))
               (sha256
                (base32