diff --git a/operating-systems/buer.scm b/operating-systems/buer.scm
index 7a208ba..161c169 100644
--- a/operating-systems/buer.scm
+++ b/operating-systems/buer.scm
@@ -234,7 +234,6 @@
                     (substitute-urls
                       `("https://ci.guix.gnu.org"
                         "https://cuirass.genenetwork.org"
-                        "https://berlin.guix.gnu.org"
                         "https://bordeaux.guix.gnu.org"))
                     (extra-options
                       `("--max-jobs=8"