diff --git a/pkgs/development/python-modules/jaconv/default.nix b/pkgs/development/python-modules/jaconv/default.nix
index e78b14e2abdc..d56e02f9d674 100644
--- a/pkgs/development/python-modules/jaconv/default.nix
+++ b/pkgs/development/python-modules/jaconv/default.nix
@@ -3,28 +3,29 @@
   buildPythonPackage,
   fetchFromGitHub,
   pythonOlder,
+  setuptools,
   pytestCheckHook,
 }:
 
 buildPythonPackage rec {
   pname = "jaconv";
   version = "0.3.4";
-  format = "setuptools";
+  pyproject = true;
 
   disabled = pythonOlder "3.7";
 
   src = fetchFromGitHub {
     owner = "ikegami-yukino";
-    repo = pname;
+    repo = "jaconv";
     rev = "refs/tags/v${version}";
     hash = "sha256-9ruhOLaYNESeKOwJs3IN6ct66fSq7My9DOyA7/cH3d0=";
   };
 
   patches = [ ./use-pytest.patch ];
 
-  nativeCheckInputs = [
-    pytestCheckHook
-  ];
+  build-system = [ setuptools ];
+
+  nativeCheckInputs = [ pytestCheckHook ];
 
   pythonImportsCheck = [ "jaconv" ];