diff --git a/judge/judger_controller/celery.py b/judge/judger_controller/celery.py
index 6befedf..5b90bdb 100644
--- a/judge/judger_controller/celery.py
+++ b/judge/judger_controller/celery.py
@@ -3,8 +3,7 @@ from __future__ import absolute_import
 from celery import Celery
 from .settings import redis_config
 
-app = Celery("judge", broker="redis://" +
-                             redis_config["host"] + ":" +
-                             str(redis_config["port"]) +
-                             "/" + str(redis_config["db"]),
+app = Celery("judge", broker='redis://%s:%s/%s' % (redis_config["host"], redis_config["port"], redis_config["db"]),
              include=["judge.judger_controller.tasks"])
+
+Celery().conf.update(CELERY_ACCEPT_CONTENT = ['json'])
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