diff --git a/phpBB/phpbb/cache/driver/redis.php b/phpBB/phpbb/cache/driver/redis.php
index eda774491c..8c9cd933a5 100644
--- a/phpBB/phpbb/cache/driver/redis.php
+++ b/phpBB/phpbb/cache/driver/redis.php
@@ -137,6 +137,10 @@ class redis extends \phpbb\cache\driver\memory
 	*/
 	function _write($var, $data, $ttl = 2592000)
 	{
+		if($ttl == 0)
+		{
+			return $this->redis->set($var, $data);
+		}
 		return $this->redis->setex($var, $ttl, $data);
 	}