diff --git a/src/Client/RedisClient.php b/src/Client/RedisClient.php
index 17fb36b..9892118 100644
--- a/src/Client/RedisClient.php
+++ b/src/Client/RedisClient.php
@@ -151,7 +151,7 @@ public function jsonDel(string $key, ?string $path = '$'): void
     /**
      * @inheritdoc
      */
-    public function createIndex(string $prefixKey, ?string $format = 'HASH', ?array $properties = []): void
+    public function createIndex(string $prefixKey, ?string $format = RedisFormat::HASH->value, ?array $properties = []): void
     {
         if ($properties === []) {
             return;