diff --git a/pkgs/development/python-modules/nbsphinx/default.nix b/pkgs/development/python-modules/nbsphinx/default.nix
index 551837cf29ea..9b96bc12d647 100644
--- a/pkgs/development/python-modules/nbsphinx/default.nix
+++ b/pkgs/development/python-modules/nbsphinx/default.nix
@@ -8,6 +8,7 @@
 , sphinx
 , traitlets
 , python
+, isPy3k
 }:
 
 buildPythonPackage rec {
@@ -32,6 +33,8 @@ buildPythonPackage rec {
     ${python.interpreter} -m nbsphinx
   '';
 
+  disabled = !isPy3k;
+
   meta = with lib; {
     description = "Jupyter Notebook Tools for Sphinx";
     homepage = "https://nbsphinx.readthedocs.io/";