Index: wp-includes/link-template.php
===================================================================
--- wp-includes/link-template.php	(revision 20751)
+++ wp-includes/link-template.php	(working copy)
@@ -1363,7 +1363,7 @@
 	$format = str_replace('%link', $link, $format);
 
 	$adjacent = $previous ? 'previous' : 'next';
-	echo apply_filters( "{$adjacent}_post_link", $format, $link );
+	echo apply_filters( "{$adjacent}_post_link", $format, $link, $post );
 }
 
 /**