1 files changed, 1 insertions, 1 deletions
diff --git a/Biz/Bild/Builder.nix b/Biz/Bild/Builder.nix
index 1a2460a..cf4d1e0 100644
--- a/Biz/Bild/Builder.nix
+++ b/Biz/Bild/Builder.nix
@@ -109,7 +109,7 @@ let
           inherit name src CODEROOT;
           propagatedBuildInputs = langdeps_ ++ sysdeps_;
           buildInputs = sysdeps_;
-          nativeCheckInputs = lib.attrsets.attrVals [ "mypy" "ruff" ] pkgs;
+          nativeCheckInputs = [ pkgs.ruff python.packages.mypy ];
           checkPhase = ''
             check() {
               $@ || { echo "fail:  $name:  $3"; exit 1; }