diff --git a/pkgs/development/python-modules/credstash/default.nix b/pkgs/development/python-modules/credstash/default.nix
index 0838c218d6fa..dd950001c3d0 100644
--- a/pkgs/development/python-modules/credstash/default.nix
+++ b/pkgs/development/python-modules/credstash/default.nix
@@ -1,14 +1,15 @@
-{ lib
-, boto3
-, buildPythonPackage
-, cryptography
-, docutils
-, fetchFromGitHub
-, fetchpatch
-, pytestCheckHook
-, pythonOlder
-, pyyaml
-, setuptools
+{
+  lib,
+  boto3,
+  buildPythonPackage,
+  cryptography,
+  docutils,
+  fetchFromGitHub,
+  fetchpatch,
+  pytestCheckHook,
+  pythonOlder,
+  pyyaml,
+  setuptools,
 }:
 
 buildPythonPackage rec {
@@ -18,7 +19,6 @@ buildPythonPackage rec {
 
   disabled = pythonOlder "3.7";
 
-
   src = fetchFromGitHub {
     owner = "fugue";
     repo = "credstash";
@@ -41,9 +41,7 @@ buildPythonPackage rec {
   # file ensures that Python imports the module from site-packages library.
   postInstall = "rm $out/bin/credstash.py";
 
-  build-system = [
-    setuptools
-  ];
+  build-system = [ setuptools ];
 
   dependencies = [
     boto3
@@ -52,9 +50,7 @@ buildPythonPackage rec {
     pyyaml
   ];
 
-  nativeBuildInputs = [
-    pytestCheckHook
-  ];
+  nativeBuildInputs = [ pytestCheckHook ];
 
   disabledTestPaths = [
     # Tests require a region