diff --git a/pkgs/development/python-modules/mozterm/default.nix b/pkgs/development/python-modules/mozterm/default.nix
index 6adba7ef2b9..98e8d5b4078 100644
--- a/pkgs/development/python-modules/mozterm/default.nix
+++ b/pkgs/development/python-modules/mozterm/default.nix
@@ -1,9 +1,12 @@
-{ lib, buildPythonPackage, fetchPypi }:
+{ lib, buildPythonPackage, fetchPypi, isPy3k }:
 
 buildPythonPackage rec {
   pname = "mozterm";
   version = "0.1.0";
 
+  # name 'unicode' is not defined
+  disabled = isPy3k;
+
   src = fetchPypi {
     inherit pname version;
     sha256 = "4ebf8bd772d97c0f557184173f0f96cfca0abfc07e1ae975fbcfa76be50b5561";