diff --git a/models/dp_delivery_carrier.py b/models/dp_delivery_carrier.py
index c45f977..2d57404 100644
--- a/models/dp_delivery_carrier.py
+++ b/models/dp_delivery_carrier.py
@@ -102,7 +102,7 @@ class DPDeliveryCarrier(models.Model):
                    'tracking_number': tracking_nr,
                    'voucher_id' : voucher.voucherId,
                    'order_id' : r.shoppingCart.shopOrderId,
-                   'wallet_balance': r.walletBalance,
+                   'wallet_balance': r.walletBallance,
                    'attachments': [(filename, voucher.png_bin)]}
         return result