diff --git a/gnu/packages/certs.scm b/gnu/packages/certs.scm
index f5ab726e0b..d09778f6da 100644
--- a/gnu/packages/certs.scm
+++ b/gnu/packages/certs.scm
@@ -1,7 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2015 Andreas Enge <andreas@enge.fr>
 ;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
-;;; Copyright © 2016, 2017 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2016, 2017, 2021 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2017 Leo Famulari <leo@famulari.name>
 ;;; Copyright © 2017, 2018 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;; Copyright © 2021 Maxim Cournoyer <maxim.cournoyer@gmail.com>
@@ -86,7 +86,7 @@ port forwarding to your local machine.")
       (home-page "https://desec.io")
       (license license:expat))))
 
-(define certdata2pem
+(define-public certdata2pem
   (let ((revision "1")
         (commit "4c576f350f44186d439179f63d5be19f710a73f5"))
     (package