diff --git a/tests/Settings/TestCuraContainerRegistry.py b/tests/Settings/TestCuraContainerRegistry.py
index 3ae6c8cca7..d94344be74 100644
--- a/tests/Settings/TestCuraContainerRegistry.py
+++ b/tests/Settings/TestCuraContainerRegistry.py
@@ -36,7 +36,6 @@ def test_loadTypes(filename, output_class, container_registry):
         else:
             return []
     container_registry.findContainers = findContainers
-    mock_definition = unittest.mock.MagicMock()
     def findContainer(container_id = "*", container_type = None, type = "*", category = None):
         return unittest.mock.MagicMock()
 
@@ -51,4 +50,4 @@ def test_loadTypes(filename, output_class, container_registry):
             assert type(container) == output_class
             break
     else:
-        assert False #Container stack with specified ID was not loaded.
+        assert False #Container stack with specified ID was not loaded.
\ No newline at end of file