--- a/server/sources/rql2sql.py	Tue Apr 28 19:12:52 2009 +0200
+++ b/server/sources/rql2sql.py	Tue Apr 28 19:14:37 2009 +0200
@@ -951,6 +951,8 @@
             if rel is not None:
                 rel._q_needcast = value
             return self.keyword_map[value]()
+        if constant.type == 'Boolean':
+            value = self.dbms_helper.boolean_value(value)
         if constant.type == 'Substitute':
             _id = constant.value
             if isinstance(_id, unicode):