diff --git a/browser/concept.py b/browser/concept.py
index 62c3049..2a57e56 100644
--- a/browser/concept.py
+++ b/browser/concept.py
@@ -73,7 +73,8 @@ class ConceptEditForm(EditForm, I18NView):
         return fields
 
     def setUpWidgets(self, ignore_request=False):
-        adapter = adapted(self.context, self.languageInfo)
+        # TODO: get rid of removeSecurityProxy(): use ConceptSchema in interfaces
+        adapter = removeSecurityProxy(adapted(self.context, self.languageInfo))
         self.adapters = {self.typeInterface: adapter,
                          IConceptSchema: adapter}
         self.widgets = setUpEditWidgets(
diff --git a/query.py b/query.py
index febd019..701d32b 100644
--- a/query.py
+++ b/query.py
@@ -29,7 +29,7 @@ from zope.app.catalog.interfaces import ICatalog
 from zope.cachedescriptors.property import Lazy
 
 from cybertools.typology.interfaces import IType
-from loops.interfaces import IConcept
+from loops.interfaces import IConcept, IConceptSchema
 from loops.common import AdapterBase
 from loops.type import TypeInterfaceSourceList
 from loops.versioning.util import getVersion
@@ -155,7 +155,7 @@ class ConceptQuery(BaseQuery):
 
 # QueryConcept: concept objects that allow querying the database.
 
-class IQueryConcept(Interface):
+class IQueryConcept(IConceptSchema):
     """ The schema for the query type.
     """