diff --git a/pkgs/development/libraries/kmsxx/default.nix b/pkgs/development/libraries/kmsxx/default.nix
index 65dce915f14..eea310a7ec4 100644
--- a/pkgs/development/libraries/kmsxx/default.nix
+++ b/pkgs/development/libraries/kmsxx/default.nix
@@ -1,5 +1,5 @@
 { lib, stdenv, fetchFromGitHub, cmake, pkg-config, libdrm
-, withPython ? false, python }:
+, withPython ? false, python ? null }:
 
 stdenv.mkDerivation {
   pname = "kmsxx";