diff --git a/src/wp-includes/script-loader.php b/src/wp-includes/script-loader.php
index 60994dce30..634153ba99 100644
--- a/src/wp-includes/script-loader.php
+++ b/src/wp-includes/script-loader.php
@@ -1352,16 +1352,17 @@ function wp_default_scripts( &$scripts ) {
 
 		$scripts->add( 'admin-gallery', "/wp-admin/js/gallery$suffix.js", array( 'jquery-ui-sortable' ) );
 
-		$scripts->add( 'admin-widgets', "/wp-admin/js/widgets$suffix.js", array( 'jquery-ui-sortable', 'jquery-ui-draggable', 'jquery-ui-droppable' ), false, 1 );
+		$scripts->add( 'admin-widgets', "/wp-admin/js/widgets$suffix.js", array( 'jquery-ui-sortable', 'jquery-ui-draggable', 'jquery-ui-droppable', 'wp-a11y' ), false, 1 );
 		did_action( 'init' ) && $scripts->add_inline_script(
 			'admin-widgets',
 			sprintf(
 				'wpWidgets.l10n = %s;',
 				wp_json_encode(
 					array(
-						'save'      => __( 'Save' ),
-						'saved'     => __( 'Saved' ),
-						'saveAlert' => __( 'The changes you made will be lost if you navigate away from this page.' ),
+						'save'        => __( 'Save' ),
+						'saved'       => __( 'Saved' ),
+						'saveAlert'   => __( 'The changes you made will be lost if you navigate away from this page.' ),
+						'widgetAdded' => __( 'Widget has been added to the selected sidebar' ),
 					)
 				)
 			)