diff --git a/src/api/credit-cards.js b/src/api/credit-cards.js
index 0c979da..6076e1c 100644
--- a/src/api/credit-cards.js
+++ b/src/api/credit-cards.js
@@ -54,8 +54,8 @@ export default class CreditCards {
 
   // @method setAsDefault(creditCardId: Number): Promise<CreditCard>
   // Sets selected credit card as default.
-  setAsDefault(creditCardId) {
-    return this.api.post(endpoints.creditCardDefault(creditCardId));
+  setAsDefault(creditCardId, isDefault = true) {
+    return this.api.post(endpoints.creditCardDefault(creditCardId), { isDefault: isDefault });
   }
 
   // @method delete(creditCardId: Number): Promise