diff --git a/linkml_runtime/utils/yamlutils.py b/linkml_runtime/utils/yamlutils.py
index 8ca8b309..d3090914 100644
--- a/linkml_runtime/utils/yamlutils.py
+++ b/linkml_runtime/utils/yamlutils.py
@@ -169,7 +169,7 @@ def form_1(entries: dict[Any, Optional[Union[dict, JsonObj]]]) -> None:
                         for lek, lev in items(list_entry):
                             if lek == key_name and not isinstance(lev, (list, dict, JsonObj)):
                                 # key_name:value
-                                order_up(list_entry[lek], slot_type(list_entry))
+                                order_up(list_entry[lek], slot_type(**list_entry))
                                 break   # Not strictly necessary, but
                             elif not isinstance(lev, (list, dict, JsonObj)):
                                 # key: value --> slot_type(key, value)