diff --git a/graphene/test/__init__.py b/graphene/test/__init__.py
index 6c47fdeb..98c8547c 100644
--- a/graphene/test/__init__.py
+++ b/graphene/test/__init__.py
@@ -1,8 +1,9 @@
-from graphene.types.schema import Schema
-
+import six
 from graphql.error import format_error as format_graphql_error
 from graphql.error import GraphQLError
 
+from graphene.types.schema import Schema
+
 
 def default_format_error(error):
     if isinstance(error, GraphQLError):