diff --git a/src/wp-admin/admin-ajax.php b/src/wp-admin/admin-ajax.php
index f284387945..6be4a87a13 100644
--- a/src/wp-admin/admin-ajax.php
+++ b/src/wp-admin/admin-ajax.php
@@ -24,6 +24,9 @@ require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );
 /** Allow for cross-domain requests (from the front end). */
 send_origin_headers();
 
+header( 'Content-Type: text/html; charset=' . get_option( 'blog_charset' ) );
+header( 'X-Robots-Tag: noindex' );
+
 // Require an action parameter
 if ( empty( $_REQUEST['action'] ) ) {
 	wp_die( '0', 400 );
@@ -35,9 +38,6 @@ require_once( ABSPATH . 'wp-admin/includes/admin.php' );
 /** Load Ajax Handlers for WordPress Core */
 require_once( ABSPATH . 'wp-admin/includes/ajax-actions.php' );
 
-header( 'Content-Type: text/html; charset=' . get_option( 'blog_charset' ) );
-header( 'X-Robots-Tag: noindex' );
-
 send_nosniff_header();
 nocache_headers();