diff --git a/wp-admin/setup-config.php b/wp-admin/setup-config.php
index 62b9086d1c..244cdc45d7 100644
--- a/wp-admin/setup-config.php
+++ b/wp-admin/setup-config.php
@@ -40,6 +40,7 @@ define('WP_DEBUG', false);
 /**#@-*/
 
 require_once(ABSPATH . WPINC . '/load.php');
+require_once(ABSPATH . WPINC . '/compat.php');
 require_once(ABSPATH . WPINC . '/functions.php');
 require_once(ABSPATH . WPINC . '/class-wp-error.php');
 require_once(ABSPATH . WPINC . '/version.php');
diff --git a/wp-settings.php b/wp-settings.php
index 63cb9d39a7..5cb2838481 100644
--- a/wp-settings.php
+++ b/wp-settings.php
@@ -63,6 +63,7 @@ if ( WP_CACHE )
 wp_set_lang_dir();
 
 // Load early WordPress files.
+require( ABSPATH . WPINC . '/compat.php' );
 require( ABSPATH . WPINC . '/functions.php' );
 require( ABSPATH . WPINC . '/class-wp.php' );
 require( ABSPATH . WPINC . '/class-wp-error.php' );