diff --git a/src/Symfony/Component/Cache/Traits/RedisTrait.php b/src/Symfony/Component/Cache/Traits/RedisTrait.php
index 72c18bf3c2..103c320f73 100644
--- a/src/Symfony/Component/Cache/Traits/RedisTrait.php
+++ b/src/Symfony/Component/Cache/Traits/RedisTrait.php
@@ -174,7 +174,7 @@ trait RedisTrait
             $connect = $params['persistent'] || $params['persistent_id'] ? 'pconnect' : 'connect';
             $redis = new $class();
 
-            $initializer = function ($redis) use ($connect, $params, $dsn, $auth, $hosts) {
+            $initializer = static function ($redis) use ($connect, $params, $dsn, $auth, $hosts) {
                 try {
                     @$redis->{$connect}($hosts[0]['host'] ?? $hosts[0]['path'], $hosts[0]['port'] ?? null, $params['timeout'], (string) $params['persistent_id'], $params['retry_interval']);
 
@@ -226,7 +226,7 @@ trait RedisTrait
                 $redis->setOption(\Redis::OPT_TCP_KEEPALIVE, $params['tcp_keepalive']);
             }
         } elseif (is_a($class, \RedisCluster::class, true)) {
-            $initializer = function () use ($class, $params, $dsn, $hosts) {
+            $initializer = static function () use ($class, $params, $dsn, $hosts) {
                 foreach ($hosts as $i => $host) {
                     $hosts[$i] = 'tcp' === $host['scheme'] ? $host['host'].':'.$host['port'] : $host['path'];
                 }