diff --git a/app.py b/app.py
index 212a871..87534b5 100644
--- a/app.py
+++ b/app.py
@@ -194,8 +194,17 @@ def add():
     barcode = data.get("barcode", "")
 
     try:
-        grocy.product_by_barcode(barcode)
-        grocy.add_product_by_barcode(barcode, 1.0, 0.0)
+        product = grocy.product_by_barcode(barcode)
+        barcode_ = None
+        amount = 1.0
+        if product:
+            for product_barcode in product.product_barcodes:
+                if product_barcode.barcode == barcode:
+                    barcode_ = product_barcode.barcode
+                    break
+            if barcode_:
+                amount = barcode_.amount
+        grocy.add_product_by_barcode(barcode, amount, 0.0)
 
         response_data = {"message": "Item added successfully"}
         return jsonify(response_data), 200