diff --git a/payment/uc_paypal/src/Controller/PayPalController.php b/payment/uc_paypal/src/Controller/PayPalController.php
index 6a33780..008b992 100644
--- a/payment/uc_paypal/src/Controller/PayPalController.php
+++ b/payment/uc_paypal/src/Controller/PayPalController.php
@@ -79,7 +79,7 @@ class PayPalController extends ControllerBase {
     }
 
     // Determine server.
-    if (empty($data['test_ipn'])) {
+    if (!empty($data['test_ipn'])) {
       $host = 'https://www.paypal.com/cgi-bin/webscr';
     }
     else {