diff --git a/lib/Redisent/RedisentCluster.php b/lib/Redisent/RedisentCluster.php
index 56faf46..ea93611 100644
--- a/lib/Redisent/RedisentCluster.php
+++ b/lib/Redisent/RedisentCluster.php
@@ -7,7 +7,7 @@
  * @package Redisent
  */
 
-require dirname(__FILE__) . '/Redisent.php';
+require_once dirname(__FILE__) . '/Redisent.php';
 
 /**
  * A generalized Redisent interface for a cluster of Redis servers