Index: wp-settings.php
===================================================================
--- wp-settings.php	(revision 17644)
+++ wp-settings.php	(working copy)
@@ -101,6 +101,7 @@
 wp_not_installed();
 
 // Load most of WordPress.
+require( ABSPATH . WPINC . '/object-types.php' );
 require( ABSPATH . WPINC . '/class-wp-walker.php' );
 require( ABSPATH . WPINC . '/class-wp-ajax-response.php' );
 require( ABSPATH . WPINC . '/formatting.php' );