diff --git a/pkgs/development/python-modules/lmtpd/default.nix b/pkgs/development/python-modules/lmtpd/default.nix
index e9dd42219eb..336b799eee2 100644
--- a/pkgs/development/python-modules/lmtpd/default.nix
+++ b/pkgs/development/python-modules/lmtpd/default.nix
@@ -1,9 +1,11 @@
-{ stdenv, buildPythonPackage, fetchPypi }:
+{ buildPythonPackage, fetchPypi, isPy3k, stdenv }:
 
 buildPythonPackage rec {
   pname = "lmtpd";
   version = "6.2.0";
 
+  disabled = !isPy3k;
+
   src = fetchPypi {
     inherit pname version;
     sha256 = "2c6825d2ffa1de099440411a742f58e1b3e8deeb3345adcfd4c2c38d4baf62b3";