diff --git a/auth/lib.py b/auth/lib.py
index 6a6d921ea..8592cad86 100644
--- a/auth/lib.py
+++ b/auth/lib.py
@@ -1,6 +1,7 @@
 # coding: utf-8
 
 import crypt, hashlib
+import string
 from random import Random
 from Crypto.Cipher import AES
 import base64