diff --git a/pkgs/development/python-modules/cnvkit/default.nix b/pkgs/development/python-modules/cnvkit/default.nix
index b92401161a26..35195b1db529 100644
--- a/pkgs/development/python-modules/cnvkit/default.nix
+++ b/pkgs/development/python-modules/cnvkit/default.nix
@@ -16,12 +16,16 @@
 , pomegranate
 , pyfaidx
 , python
+, pythonOlder
 , R
 }:
 
 buildPythonPackage rec {
   pname = "cnvkit";
   version = "0.9.10";
+  format = "setuptools";
+
+  disabled = pythonOlder "3.7";
 
   src = fetchFromGitHub {
     owner = "etal";