Index: trunk/wp-includes/query.php
===================================================================
--- trunk/wp-includes/query.php	(revision 10216)
+++ trunk/wp-includes/query.php	(working copy)
@@ -1567,7 +1567,7 @@
 		// Shorthand.
 		$q = &$this->query_vars;
 
-		$q = $this->fill_query_vars($q);
+		$q = apply_filters('query_vars', $this->fill_query_vars($q));
 
 		// First let's clear some variables
 		$distinct = '';