diff --git a/client/ayon_core/addon/base.py b/client/ayon_core/addon/base.py
index c85f38b32a..4c27cca9d7 100644
--- a/client/ayon_core/addon/base.py
+++ b/client/ayon_core/addon/base.py
@@ -10,6 +10,7 @@ import threading
 import collections
 from uuid import uuid4
 from abc import ABCMeta, abstractmethod
+from typing import Optional
 
 import six
 import appdirs