diff --git a/lib/spree_volume_pricing/engine.rb b/lib/spree_volume_pricing/engine.rb
index 59188173..f5f8750a 100644
--- a/lib/spree_volume_pricing/engine.rb
+++ b/lib/spree_volume_pricing/engine.rb
@@ -80,7 +80,7 @@ def to_range
       
       Admin::VariantsController.class_eval do
         update.before do
-          params[:variant][:volume_price_attributes] ||= {}
+          params[:variant][:volume_prices_attributes] ||= {}
         end      
         
         update.response do |wants|