diff --git a/guides/source/action_controller_overview.md b/guides/source/action_controller_overview.md
index cd4a1a0792f8407e5bef3e147c7ccd47152f011d..82a23b3dc0699d67996cbe94f5008c300ce7c2b0 100644
--- a/guides/source/action_controller_overview.md
+++ b/guides/source/action_controller_overview.md
@@ -328,9 +328,7 @@ the job done:
 
 ```ruby
 def product_params
-  params.require(:product).permit(:name).tap do |whitelisted|
-    whitelisted[:data] = params[:product][:data]
-  end
+  params.require(:product).permit(:name, { data: params[:product][:data].try(:keys) })
 end
 ```