diff --git a/program/serializers.py b/program/serializers.py
index cfd0dfde137b495275ecf08332c7594665cf8e1f..a064c297b63bbcbafa8fe631fb555a31fe0cbdf3 100644
--- a/program/serializers.py
+++ b/program/serializers.py
@@ -822,15 +822,14 @@ class ScheduleInRequestSerializer(ScheduleSerializer):
 
 
 class CollisionSerializer(serializers.Serializer):
-    id = serializers.IntegerField()
     start = serializers.DateTimeField()
     end = serializers.DateTimeField()
     playlist_id = serializers.IntegerField(allow_null=True)
     show_id = serializers.IntegerField()
     show_name = serializers.CharField()
-    repetition_of_id = serializers.IntegerField(allow_null=True)
     schedule_id = serializers.IntegerField()
     memo = serializers.CharField()
+    timeslot_id = serializers.IntegerField()
     note_id = serializers.IntegerField(allow_null=True)