diff --git a/bin/osv/orm.py b/bin/osv/orm.py
index 92fb7f9400b..4f7e5fefdae 100644
--- a/bin/osv/orm.py
+++ b/bin/osv/orm.py
@@ -2785,7 +2785,7 @@ class orm(orm_template):
         self.check_access_rule(cr, uid, ids, 'unlink', context=context)
         for sub_ids in cr.split_for_in_conditions(ids):
             cr.execute('delete from ' + self._table + ' ' \
-                       'where id in %s', sub_ids)
+                       'where id in %s', (sub_ids,))
 
         for order, object, store_ids, fields in result_store:
             if object != self._name: