diff --git a/lib/common/PayPro.js b/lib/common/PayPro.js
index 58d4bbf99ea..c217d665178 100644
--- a/lib/common/PayPro.js
+++ b/lib/common/PayPro.js
@@ -105,7 +105,7 @@ PayPro.prototype.makePayment = function(obj) {
 };
 
 PayPro.prototype.makePaymentACK = function(obj) {
-  this.messageType = 'Payment';
+  this.messageType = 'PaymentACK';
   this.message = new PayPro.PaymentACK();
   this.setObj(obj);
   return this;