diff --git a/wp-includes/query.php b/wp-includes/query.php
index 9cce173ae3..5ee5a05140 100644
--- a/wp-includes/query.php
+++ b/wp-includes/query.php
@@ -2062,6 +2062,7 @@ class WP_Query {
 						break;
 					case 'comment_count':
 						$orderby = "$wpdb->posts.comment_count";
+						break;
 					default:
 						$orderby = "$wpdb->posts.post_" . $orderby;
 				}