diff --git a/pkgs/development/python-modules/pygraphviz/default.nix b/pkgs/development/python-modules/pygraphviz/default.nix
index 3a451f4af1e..a8d80f6e617 100644
--- a/pkgs/development/python-modules/pygraphviz/default.nix
+++ b/pkgs/development/python-modules/pygraphviz/default.nix
@@ -1,10 +1,12 @@
-{ stdenv, buildPythonPackage, fetchPypi, substituteAll, graphviz
+{ stdenv, buildPythonPackage, isPy3k, fetchPypi, substituteAll, graphviz
 , pkgconfig, doctest-ignore-unicode, mock, nose }:
 
 buildPythonPackage rec {
   pname = "pygraphviz";
   version = "1.6";
 
+  disabled = !isPy3k;
+
   src = fetchPypi {
     inherit pname version;
     sha256 = "411ae84a5bc313e3e1523a1cace59159f512336318a510573b47f824edef8860";