diff --git a/pkgs/development/python-modules/marionette-harness/manifestparser.nix b/pkgs/development/python-modules/marionette-harness/manifestparser.nix
index 9e418af8a71..766e419e514 100644
--- a/pkgs/development/python-modules/marionette-harness/manifestparser.nix
+++ b/pkgs/development/python-modules/marionette-harness/manifestparser.nix
@@ -2,6 +2,7 @@
 , stdenv
 , buildPythonPackage
 , fetchPypi
+, isPy3k
 }:
 
 buildPythonPackage rec {
@@ -9,6 +10,8 @@ buildPythonPackage rec {
   version = "1.1";
   name = "${pname}-${version}";
 
+  disabled = isPy3k;
+
   src = fetchPypi {
     inherit pname version;
     sha256 = "06cnj682ynacwpi63k1427vbf7ydnwh3dchc4b11yw8ii25wbc5d";