diff --git a/seminar/utils.py b/seminar/utils.py
index 9b291b24..a41b4111 100644
--- a/seminar/utils.py
+++ b/seminar/utils.py
@@ -12,6 +12,7 @@ from django.contrib.contenttypes.models import ContentType
 from django.core.exceptions import ObjectDoesNotExist
 
 from enum import Enum
+from enum import auto
 
 import seminar.models as m
 import seminar.treelib as t