diff --git a/pkgs/development/python-modules/traitlets/default.nix b/pkgs/development/python-modules/traitlets/default.nix
index bfbb297cdc0..5d304c61f5c 100644
--- a/pkgs/development/python-modules/traitlets/default.nix
+++ b/pkgs/development/python-modules/traitlets/default.nix
@@ -1,5 +1,6 @@
 { lib
 , buildPythonPackage
+, isPy27
 , fetchPypi
 , glibcLocales
 , pytest
@@ -14,6 +15,7 @@
 buildPythonPackage rec {
   pname = "traitlets";
   version = "5.0.5";
+  disabled = isPy27;
 
   src = fetchPypi {
     inherit pname version;
@@ -27,8 +29,6 @@ buildPythonPackage rec {
     LC_ALL="en_US.UTF-8" py.test
   '';
 
-#   doCheck = false;
-
   meta = {
     description = "Traitlets Python config system";
     homepage = "http://ipython.org/";