diff --git a/parsl/monitoring/db_manager.py b/parsl/monitoring/db_manager.py
index 1b545fae95..bb6b3e1cef 100644
--- a/parsl/monitoring/db_manager.py
+++ b/parsl/monitoring/db_manager.py
@@ -5,7 +5,7 @@
 import queue
 import threading
 import time
-from typing import Any, Dict, List, Optional, Set, Tuple, TypeVar, Union, cast
+from typing import Any, Dict, List, Optional, Set, Tuple, TypeVar, cast
 
 import typeguard