diff --git a/phpBB/phpbb/cache/driver/redis.php b/phpBB/phpbb/cache/driver/redis.php
index c0b47dae46..6f103bf0f0 100644
--- a/phpBB/phpbb/cache/driver/redis.php
+++ b/phpBB/phpbb/cache/driver/redis.php
@@ -123,15 +123,17 @@ class redis extends \phpbb\cache\driver\memory
 	}
 
 	/**
-	* {@inheritDoc}
-	*/
+	 * Store data in the cache
+	 *
+	 * For the info, see https://phpredis.github.io/phpredis/Redis.html#method_set,
+	 * https://redis.io/docs/latest/commands/set/
+	 * and https://redis.io/docs/latest/commands/expire/#appendix-redis-expires
+	 *
+	 * {@inheritDoc}
+	 */
 	protected function _write(string $var, $data, int $ttl = 2592000): bool
 	{
-		if ($ttl == 0)
-		{
-			return $this->redis->set($var, $data);
-		}
-		return $this->redis->setex($var, $ttl, $data);
+		return $this->redis->set($var, $data, ['EXAT' => time() + $ttl]);
 	}
 
 	/**