diff --git a/guides/source/active_record_migrations.md b/guides/source/active_record_migrations.md
index bd7dbd0f11bea393be601f238cb9f4ec81d19afb..feb0de8eea61ee36214bbbe97ebf803bcf1d488d 100644
--- a/guides/source/active_record_migrations.md
+++ b/guides/source/active_record_migrations.md
@@ -287,7 +287,7 @@ class CreateProducts < ActiveRecord::Migration[5.0]
       t.string :name
       t.text :description
 
-      t.timestamps null: false
+      t.timestamps
     end
   end
 end