diff --git a/tests/test_document.py b/tests/test_document.py
index 60a966b7..a09aaeca 100644
--- a/tests/test_document.py
+++ b/tests/test_document.py
@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 from __future__ import with_statement
 import bson
 import os