1 files changed, 1 insertions, 0 deletions

diff --git a/setup.py b/setup.py
index 804a2f4ed..d1bbda200 100644
--- a/setup.py
+++ b/setup.py
@@ -107,6 +107,7 @@ case second `m'.  Any other spelling is incorrect.""",
         'zope.component',
         'zope.configuration',
         'zope.interface',
+        'zope.testing<4',
         ],
     extras_require=dict(
         docs=['Sphinx', 'z3c.recipe.sphinxdoc'],