diff --git a/krebs/2configs/mastodon-proxy.nix b/krebs/2configs/mastodon-proxy.nix
index 4d359c3fe..35bf6020d 100644
--- a/krebs/2configs/mastodon-proxy.nix
+++ b/krebs/2configs/mastodon-proxy.nix
@@ -5,6 +5,7 @@
     virtualHosts."social.krebsco.de" = {
       forceSSL = true;
       enableACME = true;
+      acmeFallbackHost = "hotdog.r";
       locations."/" = {
         # TODO use this in 22.11
         # recommendedProxySettings = true;