diff --git a/Components/Constants/PaymentMethodType.php b/Components/Constants/PaymentMethodType.php
index a2798fc2..14e93b13 100644
--- a/Components/Constants/PaymentMethodType.php
+++ b/Components/Constants/PaymentMethodType.php
@@ -31,9 +31,11 @@ public static function isPaymentsApiAllowed($paymentMethod)
             PaymentMethod::KLARNA_PAY_LATER,
             PaymentMethod::KLARNA_PAY_NOW,
             PaymentMethod::KLARNA_SLICE_IT,
+            PaymentMethod::KLARNA_ONE,
             $prefix . PaymentMethod::KLARNA_PAY_LATER,
             $prefix . PaymentMethod::KLARNA_PAY_NOW,
             $prefix . PaymentMethod::KLARNA_SLICE_IT,
+            $prefix . PaymentMethod::KLARNA_ONE,
             # ----------------------------------------------------------
             PaymentMethod::VOUCHERS,
             $prefix . PaymentMethod::VOUCHERS,
diff --git a/Tests/PHPUnit/Components/Constants/PaymentMethodTypeTest.php b/Tests/PHPUnit/Components/Constants/PaymentMethodTypeTest.php
index d3d359b4..19d2755b 100644
--- a/Tests/PHPUnit/Components/Constants/PaymentMethodTypeTest.php
+++ b/Tests/PHPUnit/Components/Constants/PaymentMethodTypeTest.php
@@ -59,6 +59,7 @@ public function getPaymentMethods()
             [false, PaymentMethod::KLARNA_PAY_LATER],
             [false, PaymentMethod::KLARNA_PAY_NOW],
             [false, PaymentMethod::KLARNA_SLICE_IT],
+            [false, PaymentMethod::KLARNA_ONE],
             [false, PaymentMethod::VOUCHERS],
             # ----------------------------------------------
             [true, PaymentMethod::PAYPAL],