diff --git a/aiida_test_cache/archive_cache/_utils.py b/aiida_test_cache/archive_cache/_utils.py
index da23e14..aaf0c38 100644
--- a/aiida_test_cache/archive_cache/_utils.py
+++ b/aiida_test_cache/archive_cache/_utils.py
@@ -57,6 +57,9 @@ class MockNodeCaching(node_caching_class):  #type: ignore
             """
 
             def _get_objects_to_hash(self):
+                return self.get_objects_to_hash()
+
+            def get_objects_to_hash(self):
                 return hash_objects_func(self)
 
         monkeypatch.setattr(node_class, "_CLS_NODE_CACHING", MockNodeCaching)