diff --git a/nixos/default.nix b/nixos/default.nix
index e282776..54b6805 100644
--- a/nixos/default.nix
+++ b/nixos/default.nix
@@ -63,6 +63,7 @@ with lib; {
 
         secret = mkOption {
           type = types.nullOr types.str;
+          default = null;
           description = "The environment variable REGALADE_OIDC__SECRET should be preferred";
         };