diff --git a/pkgs/development/python-modules/nixpkgs-pytools/default.nix b/pkgs/development/python-modules/nixpkgs-pytools/default.nix
index 0b6c2aad4d88..85f26363deee 100644
--- a/pkgs/development/python-modules/nixpkgs-pytools/default.nix
+++ b/pkgs/development/python-modules/nixpkgs-pytools/default.nix
@@ -10,13 +10,15 @@
 buildPythonPackage rec {
   pname = "nixpkgs-pytools";
   version = "1.3.0";
-  format = "setuptools";
+  pyproject = true;
 
   src = fetchPypi {
     inherit pname version;
     sha256 = "11skcbi1lf9qcv9j5ikifb4pakhbbygqpcmv3390j7gxsa85cn19";
   };
 
+  build-system = [ setuptools ];
+
   propagatedBuildInputs = [
     jinja2
     setuptools