Index: wp-trackback.php
===================================================================
--- wp-trackback.php	(revision 5909)
+++ wp-trackback.php	(working copy)
@@ -62,7 +62,7 @@
 
 if (empty($title) && empty($tb_url) && empty($blog_name)) {
 	// If it doesn't look like a trackback at all...
-	wp_redirect(get_permalink($tb_id));
+	wp_redirect(get_permalink($tb_id),303);
 	exit;
 }