diff --git a/proxy/core/event/manager.py b/proxy/core/event/manager.py
index 8a1244601c..b8110ebf68 100644
--- a/proxy/core/event/manager.py
+++ b/proxy/core/event/manager.py
@@ -12,7 +12,7 @@
 import threading
 import multiprocessing
 
-from typing import Optional, List, Optional, Type
+from typing import Optional, Type
 from types import TracebackType
 
 from .queue import EventQueue