diff --git a/pkgs/development/python-modules/pytest-celery/default.nix b/pkgs/development/python-modules/pytest-celery/default.nix
index 2a6ad34d706..0af07db4ec1 100644
--- a/pkgs/development/python-modules/pytest-celery/default.nix
+++ b/pkgs/development/python-modules/pytest-celery/default.nix
@@ -1,10 +1,10 @@
-{ lib, buildPythonPackage, fetchFromGitHub }:
+{ lib, buildPythonPackage, fetchFromGitHub, flit-core }:
 
 buildPythonPackage rec {
   pname = "pytest-celery";
   version = "0.1.0";
 
-  format = "flit";
+  format = "pyproject";
 
   src = fetchFromGitHub {
     owner = "celery";
@@ -19,6 +19,10 @@ buildPythonPackage rec {
       --replace '"celery >= 4.4.0"' ""
   '';
 
+  nativeBuildInputs = [
+    flit-core
+  ];
+
   # This package has nothing to test or import.
   doCheck = false;