diff --git a/manifests/repo.pp b/manifests/repo.pp
index 9e314dd..7fe8000 100644
--- a/manifests/repo.pp
+++ b/manifests/repo.pp
@@ -15,6 +15,10 @@ class megacli::repo {
         key_server  => $megacli::repo_key_server,
       }
     }
+    default: {
+      fail("Osfamily (${::osfamily}) or lsbdistid (${::lsbdistid}) is not yet unsupported. Please send a mail or check https://git.101010.fr/puppet/megacli/issues if you want a support.")
+
+    }
   }
 
 } # Private class: megacli::repo