diff --git a/pkgs/development/python-modules/before-after/default.nix b/pkgs/development/python-modules/before-after/default.nix
index af65c35dc576..692af2f66298 100644
--- a/pkgs/development/python-modules/before-after/default.nix
+++ b/pkgs/development/python-modules/before-after/default.nix
@@ -2,6 +2,7 @@
   buildPythonPackage,
   fetchPypi,
   fetchpatch,
+  setuptools,
   pytestCheckHook,
   lib,
 }:
@@ -9,7 +10,7 @@
 buildPythonPackage rec {
   pname = "before-after";
   version = "1.0.1";
-  format = "setuptools";
+  pyproject = true;
 
   src = fetchPypi {
     pname = "before_after";
@@ -29,6 +30,8 @@ buildPythonPackage rec {
     })
   ];
 
+  build-system = [ setuptools ];
+
   nativeCheckInputs = [ pytestCheckHook ];
 
   pythonImportsCheck = [ "before_after" ];