diff --git a/django_downloadview/test.py b/django_downloadview/test.py
index ef0ba00..c6c0871 100644
--- a/django_downloadview/test.py
+++ b/django_downloadview/test.py
@@ -124,7 +124,7 @@ class DownloadResponseValidator(object):
             if "filename=" in response['Content-Disposition']:
                 check_ascii = True
         if check_ascii:
-            test_case.assertIn('filename={name}'.format(
+            test_case.assertIn('filename="{name}"'.format(
                 name=ascii_name),
                 response['Content-Disposition'])
         if check_utf8: