diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index 48ed2326a..9015186a3 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -1338,6 +1338,7 @@ function rewrite_rules($matches = '', $permalink_structure = '') {
 
     $rewrite = $rewrite + $post_rewrite;
 
+    $rewrite = apply_filters('rewrite_rules_array', $rewrite);
     return $rewrite;
 }