diff --git a/test/support/person.rb b/test/support/person.rb
index 9533960..3cb4d57 100644
--- a/test/support/person.rb
+++ b/test/support/person.rb
@@ -6,6 +6,8 @@ class Person
 
 class ValidatingPerson < Person
   include ActiveModel::Validations
+  include ActiveModel::Conversion
+
   validates :name, presence: true
   validates :email, presence: true
   validates :password, presence: true