diff --git a/dvadmin_celery/views/task.py b/dvadmin_celery/views/task.py
index e26f906566c179a248b21a65b4514018db92c6fa..634e4a83023b2324fbbfa595796bd5b28682137a 100644
--- a/dvadmin_celery/views/task.py
+++ b/dvadmin_celery/views/task.py
@@ -67,7 +67,10 @@ class CeleryCrontabScheduleSerializer(CustomModelSerializer):
 
 
 class PeriodicTasksSerializer(CustomModelSerializer):
-    crontab = serializers.StringRelatedField(read_only=True)
+    def to_representation(self, value):
+        data = super().to_representation(value)
+        data['crontab'] = value.crontab.__str__()
+        return data
 
     class Meta:
         model = PeriodicTask