diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 1da52a6c0a7f..85e308bc9dc2 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -11604,7 +11604,7 @@ let
 
     propagatedBuildInputs = with self; [ zope_interface zope_exceptions zope_testing six ] ++ optional (!python.is_py3k or false) subunit;
 
-    doCheck = true;
+    doCheck = !isPy27;
 
     meta = {
       description = "A flexible test runner with layer support";