diff --git a/src/wp-signup.php b/src/wp-signup.php
index 92b6a21b4a..7ff5ebc8d4 100644
--- a/src/wp-signup.php
+++ b/src/wp-signup.php
@@ -7,6 +7,8 @@ add_action( 'wp_head', 'wp_no_robots' );
 
 require( dirname( __FILE__ ) . '/wp-blog-header.php' );
 
+nocache_headers();
+
 if ( is_array( get_site_option( 'illegal_names' ) ) && isset( $_GET['new'] ) && in_array( $_GET['new'], get_site_option( 'illegal_names' ) ) ) {
 	wp_redirect( network_home_url() );
 	die();