diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index 738b17838d..1381038418 100644
--- a/src/wp-includes/functions.php
+++ b/src/wp-includes/functions.php
@@ -1249,6 +1249,7 @@ function do_robots() {
 		$site_url = parse_url( site_url() );
 		$path = ( !empty( $site_url['path'] ) ) ? $site_url['path'] : '';
 		$output .= "Disallow: $path/wp-admin/\n";
+		$output .= "Allow: $path/wp-admin/admin-ajax.php\n";
 	}
 
 	/**