diff --git a/src/wp-includes/wp-db.php b/src/wp-includes/wp-db.php
index 66897a05b2..0298e20569 100644
--- a/src/wp-includes/wp-db.php
+++ b/src/wp-includes/wp-db.php
@@ -568,6 +568,7 @@ class wpdb {
 		'STRICT_TRANS_TABLES',
 		'STRICT_ALL_TABLES',
 		'TRADITIONAL',
+		'ANSI',
 	);
 
 	/**