diff --git a/guix/licenses.scm b/guix/licenses.scm
index a16d2241ad..bf72a33c92 100644
--- a/guix/licenses.scm
+++ b/guix/licenses.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2012, 2014, 2015, 2017, 2019 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2012, 2014, 2015, 2017, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2013, 2015 Andreas Enge <andreas@enge.fr>
 ;;; Copyright © 2012, 2013 Nikita Karetnikov <nikita@karetnikov.org>
 ;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
@@ -644,7 +644,7 @@ which may be a file:// URI pointing the package's tree."
 
 (define zlib
   (license "Zlib"
-           "http://www.gzip.org/zlib/zlib_license.html"
+           "https://zlib.net/zlib_license.html"
            "https://www.gnu.org/licenses/license-list#ZLib"))
 
 (define hpnd