diff --git a/mobilesdk/src/main/java/com/swedbankpay/mobilesdk/paymentsession/api/model/request/util/RequestUtil.kt b/mobilesdk/src/main/java/com/swedbankpay/mobilesdk/paymentsession/api/model/request/util/RequestUtil.kt
index ac5d3dff..b2092c25 100644
--- a/mobilesdk/src/main/java/com/swedbankpay/mobilesdk/paymentsession/api/model/request/util/RequestUtil.kt
+++ b/mobilesdk/src/main/java/com/swedbankpay/mobilesdk/paymentsession/api/model/request/util/RequestUtil.kt
@@ -144,7 +144,7 @@ internal object RequestUtil {
         return when {
             restrictToPaymentMethods != null -> CustomizePayment(
                 paymentMethod = null,
-                restrictToPaymentMethods = restrictToPaymentMethods
+                restrictToPaymentMethods = restrictToPaymentMethods.ifEmpty { null }
             ).toJsonString()
 
             paymentAttemptInstrument is PaymentAttemptInstrument.NewCreditCard -> CreditCardCustomizePayment(