diff --git a/app/code/Magento/Checkout/view/frontend/web/js/action/select-billing-address.js b/app/code/Magento/Checkout/view/frontend/web/js/action/select-billing-address.js
index 086859fa8021d..1f14ab444e0c1 100644
--- a/app/code/Magento/Checkout/view/frontend/web/js/action/select-billing-address.js
+++ b/app/code/Magento/Checkout/view/frontend/web/js/action/select-billing-address.js
@@ -18,7 +18,7 @@ define([
         if (quote.shippingAddress() && billingAddress.getCacheKey() == //eslint-disable-line eqeqeq
             quote.shippingAddress().getCacheKey()
         ) {
-            address = $.extend({}, billingAddress);
+            address = $.extend(true, {}, billingAddress);
             address.saveInAddressBook = null;
         } else {
             address = billingAddress;