diff --git a/pkgs/development/python-modules/atomicwrites/default.nix b/pkgs/development/python-modules/atomicwrites/default.nix
index e916a433d26d..be650f0e0375 100644
--- a/pkgs/development/python-modules/atomicwrites/default.nix
+++ b/pkgs/development/python-modules/atomicwrites/default.nix
@@ -3,18 +3,21 @@
   buildPythonPackage,
   fetchPypi,
   pytest,
+  setuptools,
 }:
 
 buildPythonPackage rec {
   pname = "atomicwrites";
   version = "1.4.1";
-  format = "setuptools";
+  pyproject = true;
 
   src = fetchPypi {
     inherit pname version;
     hash = "sha256-gbLJBxpJNnp/dwFw5e7Iy2ZWfPu8jHPSDOXKSo1xzxE=";
   };
 
+  build-system = [ setuptools ];
+
   # Tests depend on pytest but atomicwrites is a dependency of pytest
   doCheck = false;
   nativeCheckInputs = [ pytest ];