--- marshmallow/schema.py.orig	2015-11-18 14:16:22.000000000 +0100
+++ marshmallow/schema.py	2015-11-18 14:18:04.000000000 +0100
@@ -18,7 +18,7 @@
 from marshmallow.compat import (with_metaclass, iteritems, text_type,
                                 binary_type, OrderedDict)
 from marshmallow.exceptions import ValidationError
-from marshmallow.orderedset import OrderedSet
+from ordered_set import OrderedSet
 from marshmallow.decorators import (PRE_DUMP, POST_DUMP, PRE_LOAD, POST_LOAD,
                                     VALIDATES, VALIDATES_SCHEMA)