diff --git a/services/fediversity/mastodon.nix b/services/fediversity/mastodon.nix
index 8cd7454..f93fd2b 100644
--- a/services/fediversity/mastodon.nix
+++ b/services/fediversity/mastodon.nix
@@ -46,9 +46,7 @@ lib.mkIf (config.fediversity.enable && config.fediversity.mastodon.enable) {
       AWS_ACCESS_KEY_ID = snakeoil_key.id;
       AWS_SECRET_ACCESS_KEY = snakeoil_key.secret;
       S3_PROTOCOL = "http";
-      S3_HOSTNAME = config.fediversity.internal.garage.web.rootDomain;
-      # by default it tries to use "<S3_HOSTNAME>/<S3_BUCKET>"
-      S3_ALIAS_HOST = "${S3_BUCKET}.${S3_HOSTNAME}";
+      S3_ALIAS_HOST = "${S3_BUCKET}.${config.fediversity.internal.garage.web.rootDomain}";
       # SEE: the last section in https://docs.joinmastodon.org/admin/optional/object-storage/
       # TODO: can we set up ACLs with garage?
       S3_PERMISSION = "";