diff --git a/contest/views.py b/contest/views.py
index 113e640..c118855 100644
--- a/contest/views.py
+++ b/contest/views.py
@@ -118,7 +118,7 @@ class ContestAdminAPIView(APIView):
                 return error_response(u"比赛的开始时间必须早于比赛结束的时间")
 
             # 之前是封榜，现在要开放，需要清除缓存
-            if contest.real_time_rank == True and data["real_time_rank"] == False:
+            if contest.real_time_rank == False and data["real_time_rank"] == True:
                 r = redis.Redis(host=settings.REDIS_CACHE["host"], port=settings.REDIS_CACHE["port"], db=settings.REDIS_CACHE["db"])
                 cache_key = str(contest.id) + "_rank_cache"
                 r.delete(cache_key)