diff --git a/django/db/models/query.py b/django/db/models/query.py
index 3aeb071c81..fe23f1a573 100644
--- a/django/db/models/query.py
+++ b/django/db/models/query.py
@@ -417,6 +417,7 @@ class QuerySet(object):
             return {}
         qs = self._clone()
         qs.query.add_filter(('pk__in', id_list))
+        qs.query.clear_ordering(force_empty=True)
         return dict([(obj._get_pk_val(), obj) for obj in qs.iterator()])
 
     def delete(self):