diff --git a/cura/MultiMaterialDecorator.py b/cura/MultiMaterialDecorator.py
index c702ecef13..5fee777309 100644
--- a/cura/MultiMaterialDecorator.py
+++ b/cura/MultiMaterialDecorator.py
@@ -5,4 +5,7 @@ class MultiMaterialDecorator(SceneNodeDecorator):
         super().__init__()
         
     def isMultiMaterial(self):
-        return True
\ No newline at end of file
+        return True
+
+    def __deepcopy__(self, memo):
+        return MultiMaterialDecorator()
\ No newline at end of file