diff --git a/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/RedisSessionHandler.php b/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/RedisSessionHandler.php
index b07a955da3f5d..7b9785dbce9d6 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/RedisSessionHandler.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/RedisSessionHandler.php
@@ -50,7 +50,7 @@ public function __construct(\Redis|\RedisArray|\RedisCluster|\Predis\ClientInter
 
         $this->redis = $redis;
         $this->prefix = $options['prefix'] ?? 'sf_s';
-        $this->ttl = $options['ttl'] ?? null;
+        $this->setTtl($options['ttl'] ?? null);
     }
 
     /**
@@ -110,4 +110,9 @@ public function updateTimestamp(string $sessionId, string $data): bool
     {
         return $this->redis->expire($this->prefix.$sessionId, (int) ($this->ttl ?? ini_get('session.gc_maxlifetime')));
     }
+
+    public function setTtl(?int $ttl): void
+    {
+        $this->ttl = $ttl;
+    }
 }