Index: wp-includes/post.php
===================================================================
--- wp-includes/post.php	(revision 12294)
+++ wp-includes/post.php	(working copy)
@@ -1186,8 +1186,7 @@
 	delete_post_meta($postid,'_wp_trash_meta_status');
 	delete_post_meta($postid,'_wp_trash_meta_time');
 
-	/** @todo delete for pluggable post taxonomies too */
-	wp_delete_object_term_relationships($postid, array('category', 'post_tag'));
+	wp_delete_object_term_relationships($postid, get_object_taxonomies('post'));
 
 	$parent_data = array( 'post_parent' => $post->post_parent );
 	$parent_where = array( 'post_parent' => $postid );