diff --git a/app/PaymentDrivers/GoCardlessPaymentDriver.php b/app/PaymentDrivers/GoCardlessPaymentDriver.php
index f04796cfe8d4..8e28b86286a9 100644
--- a/app/PaymentDrivers/GoCardlessPaymentDriver.php
+++ b/app/PaymentDrivers/GoCardlessPaymentDriver.php
@@ -29,7 +29,7 @@ class GoCardlessPaymentDriver extends BaseDriver
 
     public $can_authorise_credit_card = true;
 
-    public $gateway;
+    public \GoCardlessPro\Client $gateway;
 
     public $payment_method;