diff --git a/openerp/addons/base/ir/ir_model_constraint.py b/openerp/addons/base/ir/ir_model_constraint.py
index 4a69bc2f0a7..a3099339131 100644
--- a/openerp/addons/base/ir/ir_model_constraint.py
+++ b/openerp/addons/base/ir/ir_model_constraint.py
@@ -45,7 +45,6 @@ class ir_model_constraint(Model):
         ids_set = set(ids)
         ids.sort()
         ids.reverse()
-        to_unlink = []
         for data in self.browse(cr, uid, ids, context):
             model = data.model.model
             model_obj = self.pool.get(model)
@@ -75,5 +74,4 @@ class ir_model_constraint(Model):
                     cr.execute('ALTER TABLE "%s" DROP CONSTRAINT "%s"' % (model_obj._table, name),)
                     _logger.info('Dropped CONSTRAINT %s@%s', name, model)
 
-            to_unlink.append(data.id)
-        self.unlink(cr, uid, to_unlink, context)
+        self.unlink(cr, uid, ids, context)
diff --git a/openerp/addons/base/ir/ir_model_relation.py b/openerp/addons/base/ir/ir_model_relation.py
index eede6eae44f..fc6dae2ca52 100644
--- a/openerp/addons/base/ir/ir_model_relation.py
+++ b/openerp/addons/base/ir/ir_model_relation.py
@@ -36,7 +36,6 @@ class ir_model_relation(Model):
         to_drop_table = []
         ids.sort()
         ids.reverse()
-        to_unlink = []
         for data in self.browse(cr, uid, ids, context):
             model = data.model
             model_obj = self.pool.get(model)
@@ -53,9 +52,7 @@ class ir_model_relation(Model):
             if cr.fetchone() and not name in to_drop_table:
                 to_drop_table.append(name)
 
-            to_unlink.append(data.id)
-
-        self.unlink(cr, uid, to_unlink, context)
+        self.unlink(cr, uid, ids, context)
 
         # drop m2m relation tables
         for table in to_drop_table: