Index: wp-includes/taxonomy.php
===================================================================
--- wp-includes/taxonomy.php	(revision 18757)
+++ wp-includes/taxonomy.php	(working copy)
@@ -1233,7 +1233,7 @@
 	else
 		$orderby = 't.name';
 
-	$orderby = apply_filters( 'get_terms_orderby', $orderby, $args );
+	$orderby = apply_filters( 'get_terms_orderby', $orderby, $args, $taxonomies );
 
 	if ( !empty($orderby) )
 		$orderby = "ORDER BY $orderby";