diff --git a/tests/Settings/TestGlobalStack.py b/tests/Settings/TestGlobalStack.py
index 2f284f2f1e..31bca56651 100644
--- a/tests/Settings/TestGlobalStack.py
+++ b/tests/Settings/TestGlobalStack.py
@@ -23,8 +23,8 @@ def test_deserializeUserChanges(filename, user_changes_id):
 
     #Mock the loading of the instances.
     def findContainer(container_id = "*", container_type = None, type = None, category = "*"):
-        if id == "some_instance":
-            return UM.Settings.ContainerRegistry._EmptyInstanceContainer(id)
+        if container_id.startswith("some_"):
+            return UM.Settings.ContainerRegistry._EmptyInstanceContainer(container_id)
         if container_type == DefinitionContainer:
             return unittest.mock.MagicMock()
     stack.findContainer = findContainer