diff --git a/themis/fields/widgets.py b/themis/fields/widgets.py
index 3f60974..070803b 100644
--- a/themis/fields/widgets.py
+++ b/themis/fields/widgets.py
@@ -23,6 +23,7 @@ from zc.relation.interfaces import ICatalog
 from zope.app.intid.interfaces import IIntIds
 
 from z3c.form.converter import BaseDataConverter
+from Products.statusmessages.interfaces import IStatusMessage
 
 from themis.fields.interfaces import ICommission, ICommissions
 from zope.schema.interfaces import IDate, IContextSourceBinder, ISource