diff --git a/flake.nix b/flake.nix
index 3f2dd28..30970c3 100644
--- a/flake.nix
+++ b/flake.nix
@@ -80,6 +80,7 @@ Some utility commands:
           };
           prefix = lib.mkOption {
             type = lib.types.str;
+            default = "-h ";
             description = lib.mdDoc ''
               Traditional text command prefix, including space, if any
             '';