diff --git a/plugins/Toolbox/src/Toolbox.py b/plugins/Toolbox/src/Toolbox.py
index ceb27542c1..f24184439d 100644
--- a/plugins/Toolbox/src/Toolbox.py
+++ b/plugins/Toolbox/src/Toolbox.py
@@ -5,7 +5,7 @@ import json
 import os
 import tempfile
 import platform
-from typing import cast, Any, Dict, List, Set, TYPE_CHECKING, Tuple, Optional
+from typing import cast, Any, Dict, List, Set, TYPE_CHECKING, Tuple, Optional, Union
 
 from PyQt5.QtCore import QUrl, QObject, pyqtProperty, pyqtSignal, pyqtSlot
 from PyQt5.QtNetwork import QNetworkAccessManager, QNetworkRequest, QNetworkReply