diff --git a/BTCPayServer/wwwroot/shopify/btcpay-browser-client.js b/BTCPayServer/wwwroot/shopify/btcpay-browser-client.js
index 8ff66ef02..f4b1ee530 100644
--- a/BTCPayServer/wwwroot/shopify/btcpay-browser-client.js
+++ b/BTCPayServer/wwwroot/shopify/btcpay-browser-client.js
@@ -16,7 +16,7 @@ var BtcPayServerModal = (function () {
             else {
                 waitForPayment.lock = true;
             }
-            window.btcpay.setApiUrlPrefix(btcpayServerUrl);
+            window.btcpay.setApiUrlPrefix(btcPayServerUrl);
             window.btcpay.onModalWillEnter(function () {
                 var interval = setInterval(function () {
                     getBtcPayInvoice(btcPayServerUrl, invoiceId, storeId)