diff --git a/openerp/osv/expression.py b/openerp/osv/expression.py
index a7539dd6108..722937fb438 100644
--- a/openerp/osv/expression.py
+++ b/openerp/osv/expression.py
@@ -1149,7 +1149,7 @@ class expression(object):
             else:  # Must not happen
                 raise ValueError("Invalid domain term %r" % (leaf,))
 
-        elif right == False and (left in model._columns) and model._columns[left]._type == "boolean" and (operator == '='):
+        elif (left in model._columns) and model._columns[left]._type == "boolean" and ((operator == '=' and right is False) or (operator == '!=' and right is True)):
             query = '(%s."%s" IS NULL or %s."%s" = false )' % (table_alias, left, table_alias, left)
             params = []
 
@@ -1157,7 +1157,8 @@ class expression(object):
             query = '%s."%s" IS NULL ' % (table_alias, left)
             params = []
 
-        elif right == False and (left in model._columns) and model._columns[left]._type == "boolean" and (operator == '!='):
+        elif (left in model._columns) and model._columns[left]._type == "boolean" and ((operator == '!=' and right is False) or (operator == '==' and right is True)):
+
             query = '(%s."%s" IS NOT NULL and %s."%s" != false)' % (table_alias, left, table_alias, left)
             params = []