diff --git a/pkgs/development/python-modules/cronsim/default.nix b/pkgs/development/python-modules/cronsim/default.nix
index 8356c6d7d5a3..d09d30c50f34 100644
--- a/pkgs/development/python-modules/cronsim/default.nix
+++ b/pkgs/development/python-modules/cronsim/default.nix
@@ -2,22 +2,28 @@
 , buildPythonPackage
 , fetchPypi
 , pytestCheckHook
+, pythonOlder
 }:
 
 buildPythonPackage rec {
   pname = "cronsim";
   version = "2.2";
+  format = "setuptools";
+
+  disabled = pythonOlder "3.7";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "sha256-LMMZni8Cipo10mxAQbRadWpPvum76JQuzlrLvFvTt5o=";
+    hash = "sha256-LMMZni8Cipo10mxAQbRadWpPvum76JQuzlrLvFvTt5o=";
   };
 
   checkInputs = [
     pytestCheckHook
   ];
 
-  pythonImportsCheck = [ "cronsim" ];
+  pythonImportsCheck = [
+    "cronsim"
+  ];
 
   meta = with lib; {
     description = "Cron expression parser and evaluator";