diff --git a/wp-includes/query.php b/wp-includes/query.php
index 07e2132ef..650a1a90e 100644
--- a/wp-includes/query.php
+++ b/wp-includes/query.php
@@ -1200,6 +1200,8 @@ class WP_Query {
 			, 'meta_key'
 			, 'meta_value'
 			, 'preview'
+			, 's'
+			, 'sentence'
 		);
 
 		foreach ($keys as $key) {
@@ -1775,7 +1777,7 @@ class WP_Query {
 				$searchand = ' AND ';
 			}
 			$term = esc_sql($q['s']);
-			if (empty($q['sentence']) && count($q['search_terms']) > 1 && $q['search_terms'][0] != $q['s'] )
+			if ( empty($q['sentence']) && count($q['search_terms']) > 1 && $q['search_terms'][0] != $q['s'] )
 				$search .= " OR ($wpdb->posts.post_title LIKE '{$n}{$term}{$n}') OR ($wpdb->posts.post_content LIKE '{$n}{$term}{$n}')";
 
 			if ( !empty($search) ) {