diff --git a/lib/Cake/Cache/Engine/RedisEngine.php b/lib/Cake/Cache/Engine/RedisEngine.php
index fb4f9c463..6dd659944 100644
--- a/lib/Cake/Cache/Engine/RedisEngine.php
+++ b/lib/Cake/Cache/Engine/RedisEngine.php
@@ -228,7 +228,7 @@ class RedisEngine extends CacheEngine {
  * Disconnects from the redis server
  */
 	public function __destruct() {
-		if (empty($this->settings['persistent']) && !is_null($this->_Redis)) {
+		if (empty($this->settings['persistent']) && $this->_Redis !== null) {
 			$this->_Redis->close();
 		}
 	}