diff --git a/contest/views.py b/contest/views.py
index 83a5219..b10e426 100644
--- a/contest/views.py
+++ b/contest/views.py
@@ -278,6 +278,8 @@ class MakeContestProblemPublicAPIView(APIView):
         problem_id = request.data.get("problem_id", -1)
         try:
             problem = ContestProblem.objects.get(id=problem_id)
+            problem.is_public = True
+            problem.save()
         except ContestProblem.DoesNotExist:
             return error_response(u"比赛不存在")
         Problem.objects.create(title=problem.title, description=problem.description,