Backport of r64677.
diff --git a/Lib/test/test_cookielib.py b/Lib/test/test_cookielib.py
index 991506c..66f9a83 100644
--- a/Lib/test/test_cookielib.py
+++ b/Lib/test/test_cookielib.py
@@ -1,4 +1,4 @@
-# -*- coding: utf-8 -*-
+# -*- coding: latin-1 -*-
 """Tests for cookielib.py."""
 
 import re, os, time