diff --git a/judge/views/contests.py b/judge/views/contests.py
index ae21e40..6fc4130 100644
--- a/judge/views/contests.py
+++ b/judge/views/contests.py
@@ -498,6 +498,7 @@ class ContestClone(ContestMixin, TitleMixin, SingleObjectFormView):
         contest.is_visible = False
         contest.user_count = 0
         contest.key = form.cleaned_data["key"]
+        contest.is_rated = False
         contest.save()
 
         contest.tags.set(tags)