diff --git a/control/webapp/utils.py b/control/webapp/utils.py
index 1794212..44bf8bb 100644
--- a/control/webapp/utils.py
+++ b/control/webapp/utils.py
@@ -38,7 +38,7 @@ def __str__(self):
 
 class WLSResponse(ucam_webauth.Response):
     keys = dict()
-    for kid in (2, 500):
+    for kid in (2, 500, 501):
         with open('/etc/apache2/ucam_webauth_keys/pubkey{}'.format(kid), 'rb') as f:
             keys[str(kid)] = ucam_webauth.rsa.load_key(f.read())