diff --git a/db-hash.php b/db-hash.php
index 6f69aaf002eadcf096242e89d463c025fb0420d4..8938929ed9c228e46c637a0d6b43a606a10c6bfd 100644
--- a/db-hash.php
+++ b/db-hash.php
@@ -1,8 +1,9 @@
 <?php
 
 require_once(dirname(__FILE__) . '/flexihash.php');
+require_once( ABSPATH . 'wp-config.php' );
 
-$wpdb->hash_map = new Flexihash();
+$wpdb->hash_map = new Flexihash(null, R2DB_FLEXIHASH_REPLICAS);
 
 /* Hashing function to map blogs to databases.
  *
@@ -16,4 +17,3 @@ function noblogs_db_callback($query, $wpdb) {
   }
 }
 $wpdb->add_callback('noblogs_db_callback');
-