diff --git a/lib/WebGUI/Shop/Cart.pm b/lib/WebGUI/Shop/Cart.pm
index 6c66f78f6..668b68c81 100644
--- a/lib/WebGUI/Shop/Cart.pm
+++ b/lib/WebGUI/Shop/Cart.pm
@@ -921,7 +921,7 @@ sub www_update {
             ##Handle rounding errors, and checkout immediately if the amount is 0 since
             ##at least the ITransact driver won't accept $0 checkout.
             if (sprintf('%.2f', $total + $self->calculateShopCreditDeduction($total)) eq '0.00') {
-                my $transaction = WebGUI::Shop::Transaction->create($session, {self => $self});
+                my $transaction = WebGUI::Shop::Transaction->create($session, {cart => $self});
                 $transaction->completePurchase('zero', 'success', 'success');
                 $self->onCompletePurchase;
                 $transaction->sendNotifications();