Index: main.py
===================================================================
--- main.py	(revision 5724)
+++ main.py	(working copy)
@@ -428,7 +428,8 @@
                 qs = qs.select_related()
 
         # Set ordering.
-        qs = qs.order_by(order_type + lookup_order_field)
+        ordering = self.model_admin.ordering or self.lookup_opts.ordering or ()
+        qs = qs.order_by(order_type + lookup_order_field, *ordering)
 
         # Apply keyword searches.
         def construct_search(field_name):