Index: src/wp-admin/includes/admin.php
===================================================================
--- src/wp-admin/includes/admin.php	(revision 32999)
+++ src/wp-admin/includes/admin.php	(working copy)
@@ -65,7 +65,7 @@
 require_once(ABSPATH . 'wp-admin/includes/user.php');
 
 /** WordPress Site Icon API */
-require_once(ABSPATH . 'wp-admin/includes/site-icon.php');
+require_once(ABSPATH . 'wp-admin/includes/class-wp-site-icon.php');
 
 /** WordPress Update Administration API */
 require_once(ABSPATH . 'wp-admin/includes/update.php');