diff --git a/addons/web/static/src/views/fields/x2many/x2many_field.js b/addons/web/static/src/views/fields/x2many/x2many_field.js
index 99a4e794896..ae4a0d07f95 100644
--- a/addons/web/static/src/views/fields/x2many/x2many_field.js
+++ b/addons/web/static/src/views/fields/x2many/x2many_field.js
@@ -247,8 +247,8 @@ export class X2ManyField extends Component {
 X2ManyField.components = { Pager, KanbanRenderer, ListRenderer, ViewButton };
 X2ManyField.props = {
     ...standardFieldProps,
-    addLabel: { type: "string", optional: true },
-    editable: { type: "string", optional: true },
+    addLabel: { type: String, optional: true },
+    editable: { type: String, optional: true },
 };
 X2ManyField.supportedTypes = ["one2many", "many2many"];
 X2ManyField.displayName = _lt("Relational table");