diff --git a/packetserver/runners/http_user_manager.py b/packetserver/runners/http_user_manager.py
index 3311479..bf248c7 100644
--- a/packetserver/runners/http_user_manager.py
+++ b/packetserver/runners/http_user_manager.py
@@ -26,7 +26,7 @@ from packetserver.http.auth import HttpUser, ph  # ph = PasswordHasher
 HTTP_USERS_KEY = "httpUsers"
 
 
-def open_database(db_arg: str) -> ZODB.DB.DB:
+def open_database(db_arg: str) -> ZODB.DB:
     """
     Open a ZODB database from either a local FileStorage path or ZEO address.
     """