diff --git a/pkgs/development/python-modules/multiset/default.nix b/pkgs/development/python-modules/multiset/default.nix
index f6b07edbdf82..ea8ee3f03f72 100644
--- a/pkgs/development/python-modules/multiset/default.nix
+++ b/pkgs/development/python-modules/multiset/default.nix
@@ -10,7 +10,7 @@
 buildPythonPackage rec {
   pname = "multiset";
   version = "3.2.0";
-  format = "pyproject";
+  pyproject = true;
 
   src = fetchPypi {
     inherit pname version;
@@ -22,15 +22,15 @@ buildPythonPackage rec {
     sed -i '/python_requires/d' setup.cfg
   '';
 
-  nativeBuildInputs = [
+  build-system = [
     setuptools
     setuptools-scm
   ];
 
-  pythonImportsCheck = [ "multiset" ];
-
   nativeCheckInputs = [ pytestCheckHook ];
 
+  pythonImportsCheck = [ "multiset" ];
+
   meta = with lib; {
     description = "Implementation of a multiset";
     homepage = "https://github.com/wheerd/multiset";