--- a/schema.py	Tue Sep 08 06:48:48 2015 +0200
+++ b/schema.py	Wed Apr 22 11:39:13 2015 +0200
@@ -1257,7 +1257,7 @@
         return _cw.execute(rql, args, build_descr=False)
 
 
-class RQLConstraint(RepoEnforcedRQLConstraintMixIn, RQLVocabularyConstraint):
+class RQLConstraint(RepoEnforcedRQLConstraintMixIn, BaseRQLConstraint):
     """the rql constraint is similar to the RQLVocabularyConstraint but
     are also enforced at the repository level
     """