diff --git a/pkgs/development/python-modules/k5test/default.nix b/pkgs/development/python-modules/k5test/default.nix
index e81294f20d5b..dbab01e01a54 100644
--- a/pkgs/development/python-modules/k5test/default.nix
+++ b/pkgs/development/python-modules/k5test/default.nix
@@ -1,19 +1,20 @@
 { lib
+, stdenv
 , buildPythonPackage
 , pythonOlder
 , fetchPypi
 , substituteAll
 , findutils
 , krb5
-, stdenv
+, setuptools
 }:
 
 buildPythonPackage rec {
   pname = "k5test";
   version = "0.10.4";
-  format = "setuptools";
+  pyproject = true;
 
-  disabled = pythonOlder "3.6";
+  disabled = pythonOlder "3.7";
 
   src = fetchPypi {
     inherit pname version;
@@ -29,6 +30,10 @@ buildPythonPackage rec {
     })
   ];
 
+  nativeBuildInputs = [
+    setuptools
+  ];
+
   # No tests
   doCheck = false;