diff --git a/pkgs/development/python-modules/ajsonrpc/default.nix b/pkgs/development/python-modules/ajsonrpc/default.nix
index 41f074aacc0e..66e94c019c59 100644
--- a/pkgs/development/python-modules/ajsonrpc/default.nix
+++ b/pkgs/development/python-modules/ajsonrpc/default.nix
@@ -1,9 +1,10 @@
-{ lib
-, pythonOlder
-, buildPythonPackage
-, fetchPypi
-, pytestCheckHook
-, setuptools
+{
+  lib,
+  pythonOlder,
+  buildPythonPackage,
+  fetchPypi,
+  pytestCheckHook,
+  setuptools,
 }:
 
 buildPythonPackage rec {
@@ -18,9 +19,7 @@ buildPythonPackage rec {
     hash = "sha256-eRusGPC/De4QkZRkTxUc+Lf/UpxLjWI5rEgQSjJRoZ8=";
   };
 
-  build-system = [
-    setuptools
-  ];
+  build-system = [ setuptools ];
 
   nativeCheckInputs = [ pytestCheckHook ];