diff --git a/pages/api/arcade/shop.js b/pages/api/arcade/shop.js
index 3204dff1..73c171d0 100644
--- a/pages/api/arcade/shop.js
+++ b/pages/api/arcade/shop.js
@@ -19,7 +19,7 @@ export const shopParts = async () => {
     let stock = fields["Stock"]
 
     if (stock && fields["Count of Orders Fulfilled"]) {
-      fields["Stock"] -= fields["Count of Orders Fulfilled"]
+      stock -= fields["Count of Orders Fulfilled"]
     }
       return { id: record.id, ...record.fields, "Stock": (stock == null)? null : (stock >= 0 ? stock : 0) }
   })