diff --git a/pytest.ini b/pytest.ini
index 94122db30..1eebe5b65 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -13,6 +13,10 @@
 # The current warnings being ignored are:
 # 1) The warning raised when importing certbot.tests.util and the external mock
 #    library is installed.
+# 2) An ImportWarning is raised with older versions of setuptools and
+#    zope.interface. See
+#    https://github.com/zopefoundation/zope.interface/issues/68 for more info.
 filterwarnings =
     error
     ignore:The external mock module:PendingDeprecationWarning
+    ignore:.*zope. missing __init__:ImportWarning