diff --git a/pkgs/tools/networking/unbound/python.nix b/pkgs/tools/networking/unbound/python.nix
index b2f43740a677..5d7096ab168f 100644
--- a/pkgs/tools/networking/unbound/python.nix
+++ b/pkgs/tools/networking/unbound/python.nix
@@ -1,6 +1,8 @@
-{ stdenv, fetchurl, openssl, expat, libevent, swig, python, pythonPackages }:
+{ stdenv, fetchurl, openssl, expat, libevent, swig, pythonPackages }:
 
-stdenv.mkDerivation rec {
+let
+  inherit (pythonPackages) python;
+in stdenv.mkDerivation rec {
   pname = "pyunbound";
   name = "${pname}-${version}";
   version = "1.5.9";