Index: wp-admin/includes/screen.php
===================================================================
--- wp-admin/includes/screen.php	(revision 18984)
+++ wp-admin/includes/screen.php	(working copy)
@@ -799,7 +799,7 @@
 		if ( isset( $wp_meta_boxes[ $this->id ] ) ) : ?>
 			<h5><?php _ex('Show on screen', 'Metaboxes') ?></h5>
 			<div class="metabox-prefs">
-				<?php meta_box_prefs( $this ); ?>
+				<?php meta_box_prefs( $this->id ); ?>
 				<br class="clear" />
 			</div>
 			<?php endif;