--- /home/job/Downloads/wordpress/wp-includes/query.php	2011-02-16 17:25:52.000000000 +0100
+++ /home/job/Downloads/wordpress/wp-includes/query_modified.php	2011-04-02 01:31:36.000000000 +0200
@@ -1439,7 +1439,7 @@
 		} else {
 		// Look for archive queries.  Dates, categories, authors, search, post type archives.
 
-			if ( !empty($qv['s']) ) {
+			if ( isset($_GET['s']) ) {
 				$this->is_search = true;
 			}