diff --git a/src/collective/task/interfaces.py b/src/collective/task/interfaces.py
index a6f2851..3241ea6 100644
--- a/src/collective/task/interfaces.py
+++ b/src/collective/task/interfaces.py
@@ -8,6 +8,7 @@ from zope.interface import provider
 
 from Products.CMFPlone.utils import base_hasattr
 from plone.autoform import directives as form
+from plone.directives.form.value import default_value
 from plone.formwidget.datetime.z3cform.widget import DatetimeFieldWidget
 from plone.supermodel import model
 from plone.theme.interfaces import IDefaultPloneLayer