diff --git a/lib/transaction/transaction.js b/lib/transaction/transaction.js
index 3ac45b3..00a64e1 100644
--- a/lib/transaction/transaction.js
+++ b/lib/transaction/transaction.js
@@ -510,7 +510,7 @@ Transaction.prototype.sign = function(privateKey, sigtype) {
   var self = this;
   if (_.isArray(privateKey)) {
     _.each(privateKey, function(privateKey) {
-      self.sign(privateKey);
+      self.sign(privateKey, sigtype);
     });
     return this;
   }