diff --git a/modules/luci-base/htdocs/luci-static/resources/ui.js b/modules/luci-base/htdocs/luci-static/resources/ui.js
index 706cc7f13b19..f65da1211dce 100644
--- a/modules/luci-base/htdocs/luci-static/resources/ui.js
+++ b/modules/luci-base/htdocs/luci-static/resources/ui.js
@@ -1090,6 +1090,7 @@ const UIDropdown = UIElement.extend(/** @lends LuCI.ui.Dropdown.prototype */ {
 			'multiple': this.options.multiple ? '' : null,
 			'optional': this.options.optional ? '' : null,
 			'disabled': this.options.disabled ? '' : null,
+			'data-widget-id': this.options.id ? `widget.${this.options.id}` : null,
 			'tabindex': -1
 		}, E('ul'));