diff --git a/adminsortable/admin.py b/adminsortable/admin.py
index cd868b7..4594467 100644
--- a/adminsortable/admin.py
+++ b/adminsortable/admin.py
@@ -183,9 +183,6 @@ class SortableAdmin(SortableAdminBase, ModelAdmin):
 
             try:
                 order_field_name = opts.model._meta.ordering[0]
-            except (AttributeError, IndexError):
-                # for Django 1.5.x
-                order_field_name = opts.ordering[0]
             except (AttributeError, IndexError):
                 order_field_name = 'order'