diff --git a/cura/Settings/ExtruderManager.py b/cura/Settings/ExtruderManager.py
index 53c0a54f85..7674aa05b9 100755
--- a/cura/Settings/ExtruderManager.py
+++ b/cura/Settings/ExtruderManager.py
@@ -205,7 +205,7 @@ class ExtruderManager(QObject):
     #   list.
     #
     #   \return A list of extruder stacks.
-    def getUsedExtruderStacks(self) -> List["ContainerStack"]:
+    def getUsedExtruderStacks(self) -> List["ExtruderStack"]:
         global_stack = self._application.getGlobalContainerStack()
         container_registry = ContainerRegistry.getInstance()