diff --git a/wp-admin/admin-ajax.php b/wp-admin/admin-ajax.php
index 3213d55028..f5b1c50f9a 100644
--- a/wp-admin/admin-ajax.php
+++ b/wp-admin/admin-ajax.php
@@ -26,7 +26,7 @@ send_origin_headers();
 
 // Require an action parameter
 if ( empty( $_REQUEST['action'] ) )
-	die( '0' );
+	wp_die( '0', 400 );
 
 /** Load WordPress Administration APIs */
 require_once( ABSPATH . 'wp-admin/includes/admin.php' );
@@ -101,4 +101,4 @@ if ( is_user_logged_in() ) {
 	do_action( 'wp_ajax_nopriv_' . $_REQUEST['action'] );
 }
 // Default status
-die( '0' );
+wp_die( '0', 400 );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index d21602e380..8669137f58 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9-alpha-41119';
+$wp_version = '4.9-alpha-41120';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.