diff --git a/configuration.nix b/configuration.nix
index 0307d73..7b589bb 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -17,6 +17,7 @@ in
     ./api/api.nix
     ./api/api-module.nix
     ./social/pleroma.nix
+    ./social/mastodon.nix
     ./letsencrypt/acme.nix
     ./letsencrypt/resolve.nix
     ./backup/restic.nix
diff --git a/users.nix b/users.nix
index 721a24a..f5adcea 100644
--- a/users.nix
+++ b/users.nix
@@ -33,7 +33,7 @@ in
           username = "${user.username}";
           email = "${user.username}@${cfg.domain}";
           hashedPassword = user.hashedPassword;
-          groups = [ "gitea" "nextcloud" "pleroma" ];
+          groups = [ "gitea" "nextcloud" "pleroma" "mastodon" ];
         })
         cfg.users);
   };