diff --git a/guides/source/active_record_callbacks.md b/guides/source/active_record_callbacks.md
index e65ab802c0bdad241d25de63f573049e5efd4027..13989a3b334c8bf3da7f6074031615030d01b8e2 100644
--- a/guides/source/active_record_callbacks.md
+++ b/guides/source/active_record_callbacks.md
@@ -68,7 +68,7 @@ class User < ActiveRecord::Base
 
   protected
     def normalize_name
-      self.name = self.name.downcase.titleize
+      self.name = name.downcase.titleize
     end
 
     def set_location