diff --git a/system/Session/Handlers/RedisHandler.php b/system/Session/Handlers/RedisHandler.php
index a6cce214f6d3..0ce94ce80791 100644
--- a/system/Session/Handlers/RedisHandler.php
+++ b/system/Session/Handlers/RedisHandler.php
@@ -273,7 +273,7 @@ public function write($id, $data): bool
             $this->redis->expire($this->lockKey, 300);
 
             if ($this->fingerprint !== ($fingerprint = md5($data)) || $this->keyExists === false) {
-                if ($this->redis->set($this->keyPrefix . $id, $data, $this->sessionExpiration)) {
+                if ($this->redis->set($this->keyPrefix . $id, $data, ['ex' => $this->sessionExpiration])) {
                     $this->fingerprint = $fingerprint;
                     $this->keyExists   = true;