diff --git a/guides/source/action_controller_overview.md b/guides/source/action_controller_overview.md
index 82a23b3dc0..0c06e36de9 100644
--- a/guides/source/action_controller_overview.md
+++ b/guides/source/action_controller_overview.md
@@ -328,7 +328,7 @@ the job done:
 
 ```ruby
 def product_params
-  params.require(:product).permit(:name, { data: params[:product][:data].try(:keys) })
+  params.require(:product).permit(:name, data: params[:product][:data].try(:keys))
 end
 ```