diff --git a/lib/private/RedisFactory.php b/lib/private/RedisFactory.php
index dcb56cee9ef8d..8f234d9c4430e 100644
--- a/lib/private/RedisFactory.php
+++ b/lib/private/RedisFactory.php
@@ -77,7 +77,7 @@ private function create() {
 			$this->instance = new \Redis();
 
 			$host = $config['host'] ?? '127.0.0.1';
-			$port = $config['port'] ?? ($host[0] !== '/' ? 6379 : null);
+			$port = $config['port'] ?? ($host[0] !== '/' ? 6379 : 0);
 
 			$this->eventLogger->start('connect:redis', 'Connect to redis and send AUTH, SELECT');
 			// Support for older phpredis versions not supporting connectionParameters