diff --git a/tests/RedisTest.php b/tests/RedisTest.php
index 5ee7ab2..6a3ac39 100644
--- a/tests/RedisTest.php
+++ b/tests/RedisTest.php
@@ -12,7 +12,8 @@ public function setUp()
     {
         parent::setUp();
 
-        $this->redis = new Redis('prefix:');
+        $this->redis = new Redis();
+        $this->redis->prefix = 'prefix:';
     }
 
     public function testPrefix()