diff --git a/BTCPayServer/Views/Invoice/Checkout.cshtml b/BTCPayServer/Views/Invoice/Checkout.cshtml
index f35d6837a..17964e9a2 100644
--- a/BTCPayServer/Views/Invoice/Checkout.cshtml
+++ b/BTCPayServer/Views/Invoice/Checkout.cshtml
@@ -182,7 +182,7 @@
         computed: {
             coinswitchAmountDue: function() {
                 return this.srvModel.coinSwitchAmountMarkupPercentage
-                    ? (1 + (this.srvModel.coinSwitchAmountMarkupPercentage / 100))
+                    ? this.srvModel.btcDue * (1 + (this.srvModel.coinSwitchAmountMarkupPercentage / 100))
                     : this.srvModel.btcDue;
             }
         }