diff --git a/manifests/init.pp b/manifests/init.pp
index dcf73a0cd8d8408f5c1b35aff5441543de6edbbf..0a6fa046b5705ebd52072a5eb054e96bd1cb0487 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -96,7 +96,15 @@ class su_debuild (
   ## Install ubuntu-archive-keyring
 
   # We add the Ubuntu keyring in case we want to build Ubuntu packages.
-  package {'ubuntu-archive-keyring': ensure => installed }
+  # This package is not (yet) in bullseye, so we only install it for
+  # buster, stretch, or sid.
+  case $::lsbdistcodename {
+    'buster', 'stretch', 'sid': {
+      package {
+         'ubuntu-archive-keyring': ensure => installed;
+      }
+    }
+  }
 
   # Additional packages to build kernel modules.
   case $::lsbdistcodename {