diff --git a/nixosConfigurations/hetzner-vpn2/headscale.nix b/nixosConfigurations/hetzner-vpn2/headscale.nix
index fd01241..05e3b5a 100644
--- a/nixosConfigurations/hetzner-vpn2/headscale.nix
+++ b/nixosConfigurations/hetzner-vpn2/headscale.nix
@@ -16,7 +16,7 @@ in
       addSSL = true;
       enableACME = true;
       locations = {
-        "/".proxyPass = "http://localhost:${headscale-port}";
+        "/".proxyPass = "http://localhost:${builtins.toString headscale-port}";
       };
     };
   };