diff --git a/plugins/3MFReader/ThreeMFReader.py b/plugins/3MFReader/ThreeMFReader.py
index b81fd435b9..80ef913b54 100755
--- a/plugins/3MFReader/ThreeMFReader.py
+++ b/plugins/3MFReader/ThreeMFReader.py
@@ -123,9 +123,9 @@ class ThreeMFReader(MeshReader):
 
                 # Get the definition & set it
                 definition_id = getMachineDefinitionIDForQualitySearch(global_container_stack.definition)
-                um_node.callDecoration("getStack").getTop().setDefinition(definition_id)
+                um_node.callDecoration("getStack").userChanges.setDefinition(definition_id)
 
-            setting_container = um_node.callDecoration("getStack").getTop()
+            setting_container = um_node.callDecoration("getStack").userChanges
 
             for key in settings:
                 setting_value = settings[key]