diff --git a/pkgs/development/python-modules/pytest-instafail/default.nix b/pkgs/development/python-modules/pytest-instafail/default.nix
index 256c3c582a29..3b237105d4c0 100644
--- a/pkgs/development/python-modules/pytest-instafail/default.nix
+++ b/pkgs/development/python-modules/pytest-instafail/default.nix
@@ -3,11 +3,15 @@
 , fetchPypi
 , pytest
 , pytestCheckHook
+, pythonOlder
 }:
 
 buildPythonPackage rec {
   pname = "pytest-instafail";
   version = "0.5.0";
+  format = "setuptools";
+
+  disabled = pythonOlder "3.7";
 
   src = fetchPypi {
     inherit pname version;