diff --git a/src/wp-includes/rss-functions.php b/src/wp-includes/rss-functions.php
index 40749db8bf..370960cecb 100644
--- a/src/wp-includes/rss-functions.php
+++ b/src/wp-includes/rss-functions.php
@@ -6,5 +6,9 @@
  * @deprecated 2.1.0
  */
 
+if ( ! defined( 'ABSPATH' ) ) {
+	exit();
+}
+
 _deprecated_file( basename( __FILE__ ), '2.1.0', WPINC . '/rss.php' );
 require_once ABSPATH . WPINC . '/rss.php';