diff --git a/guides/source/nested_model_forms.md b/guides/source/nested_model_forms.md
index 1937369776f06bcd726a0f5a6bbbb403c86bcd88..121cf2b185564d4ba9118db4ea7b8aaf95fecc62 100644
--- a/guides/source/nested_model_forms.md
+++ b/guides/source/nested_model_forms.md
@@ -106,7 +106,7 @@ Consider the following typical RESTful controller which will prepare a new Perso
 class PeopleController < ApplicationController
   def new
     @person = Person.new
-    @person.built_address
+    @person.build_address
     2.times { @person.projects.build }
   end