diff --git a/morss/wsgi.py b/morss/wsgi.py
index 1bfa471..f5f25fa 100644
--- a/morss/wsgi.py
+++ b/morss/wsgi.py
@@ -21,6 +21,8 @@ import re
 import lxml.etree
 
 import cgitb
+import wsgiref.util
+import mimetypes
 
 try:
     # python 2