diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 2c87b5da734..f1540ca2a6b 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -9779,8 +9779,7 @@ rec {
 
     propagatedBuildInputs = [ zope_interface zope_exceptions zope_testing six ] ++ optional (!python.is_py3k or false) subunit;
 
-    # a test is failing
-    doCheck = false;
+    doCheck = true;
 
     meta = {
       description = "A flexible test runner with layer support";