diff --git a/aixplain/factories/model_factory.py b/aixplain/factories/model_factory.py
index 209ff75d..b6588023 100644
--- a/aixplain/factories/model_factory.py
+++ b/aixplain/factories/model_factory.py
@@ -222,7 +222,7 @@ def _get_assets_from_page(
     @classmethod
     def list(
         cls,
-        function: Function,
+        function: Optional[Function] = None,
         query: Optional[Text] = "",
         suppliers: Optional[Union[Supplier, List[Supplier]]] = None,
         source_languages: Optional[Union[Language, List[Language]]] = None,