diff --git a/Docker/Applications/GuestBook/package/Classes/GuestBook.yaml b/Docker/Applications/GuestBook/package/Classes/GuestBook.yaml
index be324903..bf3e71d7 100644
--- a/Docker/Applications/GuestBook/package/Classes/GuestBook.yaml
+++ b/Docker/Applications/GuestBook/package/Classes/GuestBook.yaml
@@ -49,6 +49,7 @@ Methods:
       - $.redisMaster.deploy()
       - $.redisSlave: new(
           DockerRedisSlave,
+          $,
           name => 'RedisSlave',
           host => $this.redisSlaveHost,
           publish => false,