diff --git a/pkgs/development/python-modules/greek-accentuation/default.nix b/pkgs/development/python-modules/greek-accentuation/default.nix
index b42d5ef270b6..82211721621c 100644
--- a/pkgs/development/python-modules/greek-accentuation/default.nix
+++ b/pkgs/development/python-modules/greek-accentuation/default.nix
@@ -2,15 +2,18 @@
   buildPythonPackage,
   lib,
   fetchPypi,
+  setuptools,
 }:
 buildPythonPackage rec {
   pname = "greek-accentuation";
   version = "1.2.0";
-  format = "setuptools";
+  pyproject = true;
   src = fetchPypi {
     inherit pname version;
     hash = "sha256-l2HZXdqlLubvy2bWhhZVYGMpF0DXVKTDFehkcGF5xdk=";
   };
+
+  build-system = [ setuptools ];
   meta = {
     description = "Python 3 library for accenting (and analyzing the accentuation of) Ancient Greek words";
     homepage = "https://github.com/jtauber/greek-accentuation";