diff --git a/lib/Predis.php b/lib/Predis.php
index c66b342a..699af354 100644
--- a/lib/Predis.php
+++ b/lib/Predis.php
@@ -2080,7 +2080,7 @@ namespace Predis\Shared;
 
 class Utils {
     public static function isCluster(\Predis\IConnection $connection) {
-        return $connection instanceof \Predis\ConnectionCluster;
+        return $connection instanceof \Predis\IConnectionCluster;
     }
 
     public static function onCommunicationException(\Predis\CommunicationException $exception) {