diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2d348de..def63d7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [unreleased] -
+
+### Fixed
+
+- Fixed the `Tree cascade Dropdown` field so that it works when it is a required field in single-level responses
+
 ## [1.1.0] - 2026-04-27
 
 ### Add
diff --git a/templates/tree_cascade_dropdown.html.twig b/templates/tree_cascade_dropdown.html.twig
index b2eb1d5..e49b9fb 100644
--- a/templates/tree_cascade_dropdown.html.twig
+++ b/templates/tree_cascade_dropdown.html.twig
@@ -126,6 +126,7 @@
             class="form-select af-tree-cascade-select"
             aria-label="{{ aria_label }}"
             data-af-tree-questions-id="{{ question.fields['id'] }}"
+            data-af-tree-field-name="{{ final_items_id_name }}"
             data-af-tree-ajax-limit="{{ ajax_limit_count }}"
         >
             <option value="0">---</option>