Index: wp-settings.php
===================================================================
--- wp-settings.php	(revision 12626)
+++ wp-settings.php	(working copy)
@@ -216,7 +216,8 @@
 		ini_set('error_log', WP_CONTENT_DIR . '/debug.log');
 	}
 } else {
-	define('WP_DEBUG', false);
+	if ( ! defined('WP_DEBUG') )
+		define('WP_DEBUG', false);
 	if ( defined('E_RECOVERABLE_ERROR') )
 		error_reporting(E_ERROR | E_WARNING | E_PARSE | E_USER_ERROR | E_USER_WARNING | E_RECOVERABLE_ERROR);
 	else