diff --git a/lib/PayPro.js b/lib/PayPro.js
index 4812f14..5a073c3 100644
--- a/lib/PayPro.js
+++ b/lib/PayPro.js
@@ -11,6 +11,8 @@ PayPro.prototype.x509Sign = function(key) {
   var crypto = require('crypto');
   var pki_type = this.get('pki_type');
   var pki_data = this.get('pki_data'); // contains one or more x509 certs
+  pki_data = PayPro.X509Certificates.decode(pki_data);
+  pki_data = pki_data.certificate;
   var details = this.get('serialized_payment_details');
   var type = pki_type.split('+')[1].toUpperCase();
 
@@ -38,6 +40,8 @@ PayPro.prototype.x509Verify = function() {
   var pki_type = this.get('pki_type');
   var sig = this.get('signature');
   var pki_data = this.get('pki_data');
+  pki_data = PayPro.X509Certificates.decode(pki_data);
+  pki_data = pki_data.certificate;
   var details = this.get('serialized_payment_details');
   var buf = this.serializeForSig();
   var type = pki_type.split('+')[1].toUpperCase();
diff --git a/lib/browser/PayPro.js b/lib/browser/PayPro.js
index 253d6ba..e41a8e0 100644
--- a/lib/browser/PayPro.js
+++ b/lib/browser/PayPro.js
@@ -13,6 +13,8 @@ var RootCerts = require('../common/RootCerts');
 PayPro.prototype.x509Sign = function(key) {
   var pki_type = this.get('pki_type');
   var pki_data = this.get('pki_data'); // contains one or more x509 certs
+  pki_data = PayPro.X509Certificates.decode(pki_data);
+  pki_data = pki_data.certificate;
   var type = pki_type.split('+')[1].toUpperCase();
   var buf = this.serializeForSig();
 
@@ -51,6 +53,8 @@ PayPro.prototype.x509Verify = function(key) {
   var sig = this.get('signature');
   var pki_type = this.get('pki_type');
   var pki_data = this.get('pki_data');
+  pki_data = PayPro.X509Certificates.decode(pki_data);
+  pki_data = pki_data.certificate;
   var buf = this.serializeForSig();
   var type = pki_type.split('+')[1].toUpperCase();