diff --git a/lib/primitives/mtx.js b/lib/primitives/mtx.js
index 42d64994..2083c629 100644
--- a/lib/primitives/mtx.js
+++ b/lib/primitives/mtx.js
@@ -225,6 +225,9 @@ MTX.prototype.addTX = function addTX(tx, index, height) {
 MTX.prototype.addOutput = function addOutput(options, value) {
   var output;
 
+  if (typeof options === 'string')
+    options = Address.fromBase58(options);
+
   if (options instanceof Address)
     options = Script.fromAddress(options);