diff --git a/app/serializers/assigned_topic_serializer.rb b/app/serializers/assigned_topic_serializer.rb
index 8a3530f..f6f18bb 100644
--- a/app/serializers/assigned_topic_serializer.rb
+++ b/app/serializers/assigned_topic_serializer.rb
@@ -9,5 +9,5 @@ class AssignedTopicSerializer < BasicTopicSerializer
              :updated_at
 
   has_one :user, serializer: BasicUserSerializer, embed: :objects
-  has_one :assigned_to_user, serializer: AssignedUserSerializer, embed: :objects
+  has_one :assigned_to_user, serializer: BasicUserSerializer, embed: :objects
 end
diff --git a/app/serializers/assigned_user_serializer.rb b/app/serializers/assigned_user_serializer.rb
deleted file mode 100644
index bbf2b62..0000000
--- a/app/serializers/assigned_user_serializer.rb
+++ /dev/null
@@ -1,17 +0,0 @@
-# frozen_string_literal: true
-
-class AssignedUserSerializer < BasicUserSerializer
-  attributes :custom_fields
-
-  def custom_fields
-    fields = User.whitelisted_user_custom_fields(scope)
-
-    result = {}
-    fields.each do |k|
-      result[k] = object.custom_fields[k] if object.custom_fields[k].present?
-    end
-
-    result
-  end
-
-end