diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index ca6ce2af42f..feae4222010 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -80,6 +80,9 @@ rec {
 
     propagatedBuildInputs = [ twisted pkgs.pyopenssl ];
 
+    # For some reason "python setup.py test" doesn't work with Python 2.6.
+    doCheck = false;
+
     meta = {
       homepage = http://foolscap.lothar.com/;