diff --git a/operating-systems/buer.scm b/operating-systems/buer.scm
index 6b3eb02..074dd38 100644
--- a/operating-systems/buer.scm
+++ b/operating-systems/buer.scm
@@ -235,7 +235,8 @@
                             (list channel:guix
                                   channel:radix)))
                     (authorized-keys
-                      (list substitute-key:genenetwork.pub))
+                     (cons* substitute-key:genenetwork.pub
+                            %default-authorized-guix-keys))
                     (substitute-urls
                       `("https://ci.guix.gnu.org"
                         "https://cuirass.genenetwork.org"