diff --git a/tiramisu_json_api/api.py b/tiramisu_json_api/api.py
index 0ee8753..2f5f713 100644
--- a/tiramisu_json_api/api.py
+++ b/tiramisu_json_api/api.py
@@ -182,7 +182,7 @@ class _Value:
             if self.config.is_hidden(key, None) is False:
                 if flatten:
                     nkey = key.split('.')[-1]
-                elif len_parent is not None:
+                elif not fullpath and len_parent is not None:
                     nkey = key[len_parent:]
                 else:
                     nkey = key