diff --git a/app/assets/javascripts/solidus_paypal_braintree/paypal_button.js b/app/assets/javascripts/solidus_paypal_braintree/paypal_button.js
index 7ca57ac7..1cf6629c 100644
--- a/app/assets/javascripts/solidus_paypal_braintree/paypal_button.js
+++ b/app/assets/javascripts/solidus_paypal_braintree/paypal_button.js
@@ -41,6 +41,7 @@ SolidusPaypalBraintree.PaypalButton.prototype.initializeCallback = function() {
   this._paymentMethodId = this._client.paymentMethodId;
 
   this._client.getPaypalInstance().loadPayPalSDK({
+    "client-id": this._environment === "sandbox" ? "sb" : null,
     currency: this._paypalOptions.currency,
     commit: true,
     vault: this._paypalOptions.flow == "vault",