diff --git a/cura/Settings/ExtruderStack.py b/cura/Settings/ExtruderStack.py
index 3241268781..1a437128a9 100644
--- a/cura/Settings/ExtruderStack.py
+++ b/cura/Settings/ExtruderStack.py
@@ -6,6 +6,8 @@ from PyQt5.QtCore import pyqtProperty, pyqtSignal, pyqtSlot
 from UM.MimeTypeDatabase import MimeType, MimeTypeDatabase
 from UM.Settings.ContainerStack import ContainerStack
 from UM.Settings.ContainerRegistry import ContainerRegistry
+from UM.Settings.InstanceContainer import InstanceContainer
+from UM.Settings.DefinitionContainer import DefinitionContainer
 
 class ExtruderStack(ContainerStack):
     def __init__(self, container_id, *args, **kwargs):
diff --git a/cura/Settings/GlobalStack.py b/cura/Settings/GlobalStack.py
index eb67c12499..a6cbcd2b33 100644
--- a/cura/Settings/GlobalStack.py
+++ b/cura/Settings/GlobalStack.py
@@ -1,7 +1,9 @@
 # Copyright (c) 2017 Ultimaker B.V.
 # Cura is released under the terms of the AGPLv3 or higher.
 
-from PyQt5.QtCore import pyqtProperty, pyqtSlot
+from typing import Any
+
+from PyQt5.QtCore import pyqtProperty, pyqtSlot, pyqtSignal
 
 from UM.Decorators import override