diff --git a/organize/interfaces.py b/organize/interfaces.py
index 97fb115..7b59a0b 100644
--- a/organize/interfaces.py
+++ b/organize/interfaces.py
@@ -165,7 +165,7 @@ class ITask(IConceptSchema, ITask):
 
 # 'allocated' predicate
 
-class IAllocated(Interface):
+class IAllocated(IConceptSchema):
 
     allocType = schema.Choice(
             title=_(u'Allocation Type'),
diff --git a/organize/task.py b/organize/task.py
index bfa9464..8f7f470 100644
--- a/organize/task.py
+++ b/organize/task.py
@@ -40,5 +40,5 @@ class Task(AdapterBase):
     implements(ITask)
 
     _adapterAttributes = ('context', '__parent__',)
-    _contextAttributes = list(ITask) + list(IConcept)
+    _contextAttributes = list(ITask) # + list(IConcept)