Index: wp-includes/class-wp-admin-bar.php
===================================================================
--- wp-includes/class-wp-admin-bar.php	(revision 40267)
+++ wp-includes/class-wp-admin-bar.php	(working copy)
@@ -485,7 +485,7 @@
 
 		if ( $is_parent ) {
 			$menuclass = 'menupop ';
-			$aria_attributes .= ' aria-haspopup="true"';
+			$aria_attributes .= ' aria-haspopup="true" role="menuitem"';
 		}
 
 		if ( ! empty( $node->meta['class'] ) )