diff --git a/tests/Settings/MockContainer.py b/tests/Settings/MockContainer.py
index bb99710ef6..9c20f55405 100644
--- a/tests/Settings/MockContainer.py
+++ b/tests/Settings/MockContainer.py
@@ -153,6 +153,9 @@ class MockContainer(ContainerInterface, UM.PluginObject.PluginObject):
     def isDirty(self):
         return True
 
+    def setDirty(self, dirty):
+        pass
+
     metaDataChanged = Signal()
     propertyChanged = Signal()
     containersChanged = Signal()