Index: wp-includes/functions.wp-scripts.php
===================================================================
--- wp-includes/functions.wp-scripts.php	(revision 23389)
+++ wp-includes/functions.wp-scripts.php	(working copy)
@@ -119,7 +119,7 @@
 			'jquery-ui-draggable', 'jquery-ui-droppable', 'jquery-ui-menu', 'jquery-ui-mouse',
 			'jquery-ui-position', 'jquery-ui-progressbar', 'jquery-ui-resizable', 'jquery-ui-selectable',
 			'jquery-ui-slider', 'jquery-ui-sortable', 'jquery-ui-spinner', 'jquery-ui-tabs',
-			'jquery-ui-tooltip', 'jquery-ui-widget',
+			'jquery-ui-tooltip', 'jquery-ui-widget', 'backbone', 'underscore',
 		);
 
 		if ( in_array( $handle, $no ) ) {