diff --git a/modules/services/step-ca/mtls.nix b/modules/services/step-ca/mtls.nix
index 8ec5f1f..e57aa89 100644
--- a/modules/services/step-ca/mtls.nix
+++ b/modules/services/step-ca/mtls.nix
@@ -254,10 +254,9 @@ in
   flake.modules.homeManager.mtls = { config, lib, pkgs, ... }:
     let
       cfg = config.mtls;
-      certDir = cfg.certDir;
-      tlsKey = "${certDir}/${cfg.keyFilename}";
-      tlsCert = "${certDir}/${cfg.certFilename}";
-      mtlsBundle = "${certDir}/${cfg.bundleFilename}";
+      tlsKey = "${cfg.certDir}/${cfg.keyFilename}";
+      tlsCert = "${cfg.certDir}/${cfg.certFilename}";
+      mtlsBundle = "${cfg.certDir}/${cfg.bundleFilename}";
       sanArgs = lib.concatMapStringsSep " " (san: "--san \"${san}\"") cfg.san;
     in
     {