diff --git a/lib/bip70/paymentrequest.js b/lib/bip70/paymentrequest.js
index c954704c..d76fc9a7 100644
--- a/lib/bip70/paymentrequest.js
+++ b/lib/bip70/paymentrequest.js
@@ -207,8 +207,7 @@ PaymentRequest.prototype.setChain = function setChain(chain) {
 
   assert(Array.isArray(chain), 'Chain must be an array.');
 
-  for (let i = 0; i < chain.length; i++) {
-    let cert = chain[i];
+  for (let cert of chain) {
     if (typeof cert === 'string') {
       let pem = PEM.decode(cert);
       assert(pem.type === 'certificate', 'Bad certificate PEM.');