diff --git a/models/dp_delivery_carrier.py b/models/dp_delivery_carrier.py
index 31a0db8..2966185 100644
--- a/models/dp_delivery_carrier.py
+++ b/models/dp_delivery_carrier.py
@@ -124,7 +124,7 @@ class DPDeliveryCarrier(models.Model):
         position = im.build_position(service.code, im_sender, im_recipient)
         im.add_position(position)
         if im.wallet_balance < im.compute_total():
-            raise Warning("Wallet balance %f is less than label cost %f!" % (im.wallet_balance/100, im.compute_total()/100)
+            raise Warning("Wallet balance %f is less than label cost %f!" % (im.wallet_balance/100, im.compute_total()/100))
         r = im.checkoutPNG()
         voucher = r.shoppingCart.voucherList.voucher[0]
         filename = 'DP'+voucher.voucherId+'.png'