diff --git a/test/fixtures/poro.rb b/test/fixtures/poro.rb
index 0c0e3a587..7293e5468 100644
--- a/test/fixtures/poro.rb
+++ b/test/fixtures/poro.rb
@@ -134,7 +134,8 @@ def custom_options
 
 AuthorSerializer = Class.new(ActiveModel::Serializer) do
   cache key:'writer', skip_digest: true
-  attributes :id, :name
+  attribute :id
+  attribute :name
 
   has_many :posts, embed: :ids
   has_many :roles, embed: :ids