diff --git a/tests/TestMachineManager.py b/tests/TestMachineManager.py
index a5d9d314cd..64a7891197 100644
--- a/tests/TestMachineManager.py
+++ b/tests/TestMachineManager.py
@@ -15,6 +15,7 @@ def machine_manager(application, extruder_manager, container_registry, global_st
     application.getGlobalContainerStack = MagicMock(return_value = global_stack)
     with patch("cura.Settings.CuraContainerRegistry.CuraContainerRegistry.getInstance", MagicMock(return_value=container_registry)):
         manager = MachineManager(application)
+        manager._onGlobalContainerChanged()
 
     return manager