diff --git a/api/v1/serializers/course.py b/api/v1/serializers/course.py
index 52e16a25..a9679fee 100644
--- a/api/v1/serializers/course.py
+++ b/api/v1/serializers/course.py
@@ -383,6 +383,7 @@ class CommentSerializer(serializers.ModelSerializer):
             'content',
             'author',
             'parent',
+            'deactivated_at',
             'created_at',
             'update_at',
         )