--- wp-signup.php.orig	2011-11-15 22:44:48.000000000 +0200
+++ wp-signup.php	2011-12-06 23:02:09.816726009 +0200
@@ -184,7 +184,7 @@
 	<p><?php _e( 'If you&#8217;re not going to use a great site domain, leave it for a new user. Now have at it!' ) ?></p>
 	<form id="setupform" method="post" action="wp-signup.php">
 		<input type="hidden" name="stage" value="gimmeanotherblog" />
-		<?php do_action( 'signup_hidden_fields' ); ?>
+		<?php do_action( 'signup_hidden_fields', 'gimmeanotherblog' ); ?>
 		<?php show_blog_form($blogname, $blog_title, $errors); ?>
 		<p class="submit"><input type="submit" name="submit" class="submit" value="<?php esc_attr_e( 'Create Site' ) ?>" /></p>
 	</form>
@@ -248,7 +248,7 @@
 	<h2><?php printf( __( 'Get your own %s account in seconds' ), $current_site->site_name ) ?></h2>
 	<form id="setupform" method="post" action="wp-signup.php">
 		<input type="hidden" name="stage" value="validate-user-signup" />
-		<?php do_action( 'signup_hidden_fields' ); ?>
+		<?php do_action( 'signup_hidden_fields', 'validate-user-signup' ); ?>
 		<?php show_user_form($user_name, $user_email, $errors); ?>
 
 		<p>
@@ -319,7 +319,7 @@
 		<input type="hidden" name="stage" value="validate-blog-signup" />
 		<input type="hidden" name="user_name" value="<?php echo esc_attr($user_name) ?>" />
 		<input type="hidden" name="user_email" value="<?php echo esc_attr($user_email) ?>" />
-		<?php do_action( 'signup_hidden_fields' ); ?>
+		<?php do_action( 'signup_hidden_fields', 'validate-blog-signup' ); ?>
 		<?php show_blog_form($blogname, $blog_title, $errors); ?>
 		<p class="submit"><input type="submit" name="submit" class="submit" value="<?php esc_attr_e('Signup') ?>" /></p>
 	</form>