diff --git a/unicorespawner/spawner.py b/unicorespawner/spawner.py
index a70bda52f00ce30d5fb25710095ed3443f82f58e..7115cde862f06f14192b21193eb93efcb5531dbd 100644
--- a/unicorespawner/spawner.py
+++ b/unicorespawner/spawner.py
@@ -5,6 +5,7 @@ import re
 import time
 import uuid
 from datetime import datetime
+from datetime import timedelta
 
 import pyunicore.client as pyunicore
 from forwardbasespawner import ForwardBaseSpawner