diff --git a/hosts/mastodon/default.nix b/hosts/mastodon/default.nix
index 9557b126..3b3e0be5 100644
--- a/hosts/mastodon/default.nix
+++ b/hosts/mastodon/default.nix
@@ -39,7 +39,7 @@
       elasticsearch.host = "127.0.0.1";
 
       extraConfig = {
-        ALTERNATE_DOMAINS = lib.concatStringsSep "," config.security.acme.certs."c3d2.social".extraDomainNames;
+        ALTERNATE_DOMAINS = lib.concatStringsSep "," config.services.nginx.virtualHosts.${config.services.mastodon.localDomain}.serverAliases;
         DEFAULT_LOCALE = "de";
         WEB_CONCURRENCY = toString config.deployment.vcpu;
         # MAX_THREADS = toString 5;