diff --git a/module.nix b/module.nix
index 61326cc..a96810c 100644
--- a/module.nix
+++ b/module.nix
@@ -99,6 +99,7 @@ in
       settings = {
         server.port = 8081;
         app = {
+          host = lib.mkForce "https://${cfg.subdomain}.${sp.domain}";
           site_name = cfg.appName;
           single_user = false;
           federation = cfg.enableFederation;