diff --git a/pkgs/servers/mail/mailman/default.nix b/pkgs/servers/mail/mailman/default.nix
index 8cbcf93497d..13455cb3f53 100644
--- a/pkgs/servers/mail/mailman/default.nix
+++ b/pkgs/servers/mail/mailman/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, python, python3Packages }:
+{ stdenv, fetchurl, python, pythonPackages }:
 
 stdenv.mkDerivation rec {
   name = "mailman-2.1.18";
@@ -8,7 +8,7 @@ stdenv.mkDerivation rec {
     sha256 = "0jc360crakvpz71msl0h11zv3849fqzlj9jfh1g7x3j4459n07fw";
   };
 
-  buildInputs = [ python python3Packages.dns ];
+  buildInputs = [ python pythonPackages.dns ];
 
   patches = [ ./fix-var-prefix.patch ];