diff --git a/cura/Settings/MachineManager.py b/cura/Settings/MachineManager.py
index 6712bef92d..69f672ab0f 100755
--- a/cura/Settings/MachineManager.py
+++ b/cura/Settings/MachineManager.py
@@ -863,7 +863,7 @@ class MachineManager(QObject):
     #   \param quality_name \type{str} the name of the quality.
     #   \return \type{List[Dict]} with keys "stack", "quality" and "quality_changes".
     @UM.FlameProfiler.profile
-    def determineQualityAndQualityChangesForQualityType(self, quality_type: str) -> List[Dict[str, Union[CuraContainerStack, InstanceContainer]]]:
+    def determineQualityAndQualityChangesForQualityType(self, quality_type: str) -> List[Dict[str, Union["CuraContainerStack", InstanceContainer]]]:
         quality_manager = QualityManager.getInstance()
         result = []
         empty_quality_changes = self._empty_quality_changes_container
@@ -900,7 +900,7 @@ class MachineManager(QObject):
     #
     #   \param quality_changes_name \type{str} the name of the quality changes.
     #   \return \type{List[Dict]} with keys "stack", "quality" and "quality_changes".
-    def _determineQualityAndQualityChangesForQualityChanges(self, quality_changes_name: str) -> Optional[List[Dict[str, Union[CuraContainerStack, InstanceContainer]]]]:
+    def _determineQualityAndQualityChangesForQualityChanges(self, quality_changes_name: str) -> Optional[List[Dict[str, Union["CuraContainerStack", InstanceContainer]]]]:
         result = []
         quality_manager = QualityManager.getInstance()