diff --git a/makefu/krops.nix b/makefu/krops.nix
index 36c882d7e..d7f12aa39 100644
--- a/makefu/krops.nix
+++ b/makefu/krops.nix
@@ -84,7 +84,7 @@ in {
   };
 
   # usage: $(nix-build --no-out-link --argstr name HOSTNAME --argstr target PATH -A test)
-  test = { target ? target }: pkgs.krops.writeTest "${name}-test" {
+  test = pkgs.krops.writeTest "${name}-test" {
     force = true;
     inherit target;
     source = source { test = true; };