diff --git a/hosts/mastodon/default.nix b/hosts/mastodon/default.nix
index 420d42da..1a49de01 100644
--- a/hosts/mastodon/default.nix
+++ b/hosts/mastodon/default.nix
@@ -48,6 +48,7 @@
     extraConfig = {
       ALTERNATE_DOMAINS = lib.concatStringsSep "," [
         "${config.networking.hostName}.flpk.zentralwerk.org"
+        "social.c3d2.de"
       ];
       DEFAULT_LOCALE = "de";
       WEB_CONCURRENCY = toString config.deployment.vcpu;