diff --git a/modules/services/nsd-acme/default.nix b/modules/services/nsd-acme/default.nix
index 6c241e2..09686a9 100644
--- a/modules/services/nsd-acme/default.nix
+++ b/modules/services/nsd-acme/default.nix
@@ -143,6 +143,7 @@ in {
               StateDirectory = "nsd-acme/${sanitized}";
               LoadCredential = ["letsencrypt-account-key:${cfg.accountKey}"];
               ReadWritePaths = ["/var/lib/nsd/acmezones"];
+              SuccessExitStatus = [0 1];
 
               # from nixos/modules/security/acme/default.nix
               ProtectSystem = "strict";