Index: wp-includes/ms-settings.php
===================================================================
--- wp-includes/ms-settings.php	(revision 20831)
+++ wp-includes/ms-settings.php	(working copy)
@@ -14,7 +14,7 @@
 require( ABSPATH . WPINC . '/ms-load.php' );
 require( ABSPATH . WPINC . '/ms-default-constants.php' );
 
-if ( defined( 'SUNRISE' ) )
+if ( defined( 'SUNRISE' ) && SUNRISE )
 	include_once( WP_CONTENT_DIR . '/sunrise.php' );
 
 /** Check for and define SUBDOMAIN_INSTALL and the deprecated VHOST constant. */