diff --git a/lib/script/script.js b/lib/script/script.js
index f93ace2..13d69a7 100644
--- a/lib/script/script.js
+++ b/lib/script/script.js
@@ -182,8 +182,9 @@ Script.fromString = function(str) {
   return script;
 };
 
-Script.prototype._chunkToString = function(chunk) {
+Script.prototype._chunkToString = function(chunk, type) {
   var opcodenum = chunk.opcodenum;
+  var asm = (type === 'asm');
   var str = '';
   if (!chunk.buf) {
     // no data chunk
@@ -194,7 +195,11 @@ Script.prototype._chunkToString = function(chunk) {
       if (numstr.length % 2 !== 0) {
         numstr = '0' + numstr;
       }
-      str = str + ' ' + '0x' + numstr;
+      if (asm) {
+        str = str + ' ' + numstr;
+      } else {
+        str = str + ' ' + '0x' + numstr;
+      }
     }
   } else {
     // data chunk
@@ -203,14 +208,27 @@ Script.prototype._chunkToString = function(chunk) {
       opcodenum === Opcode.OP_PUSHDATA4) {
       str = str + ' ' + Opcode(opcodenum).toString();
     }
-    str = str + ' ' + chunk.len;
     if (chunk.len > 0) {
-      str = str + ' ' + '0x' + chunk.buf.toString('hex');
+      if (asm) {
+        str = str + ' ' + chunk.buf.toString('hex');
+      } else {
+        str = str + ' ' + chunk.len + ' ' + '0x' + chunk.buf.toString('hex');
+      }
     }
   }
   return str;
 };
 
+Script.prototype.toASM = function() {
+  var str = '';
+  for (var i = 0; i < this.chunks.length; i++) {
+    var chunk = this.chunks[i];
+    str += this._chunkToString(chunk, 'asm');
+  }
+
+  return str.substr(1);
+};
+
 Script.prototype.toString = function() {
   var str = '';
   for (var i = 0; i < this.chunks.length; i++) {
diff --git a/test/script/script.js b/test/script/script.js
index dd138a2..7ecfb20 100644
--- a/test/script/script.js
+++ b/test/script/script.js
@@ -439,7 +439,7 @@ describe('Script', function() {
     });
 
     it('should work for no data OP_RETURN', function() {
-      Script().add(Opcode.OP_RETURN).add(new Buffer('')).toString().should.equal('OP_RETURN 0');
+      Script().add(Opcode.OP_RETURN).add(new Buffer('')).toString().should.equal('OP_RETURN');
     });
     it('works with objects', function() {
       Script().add({
@@ -558,7 +558,7 @@ describe('Script', function() {
       var data = new Buffer('');
       var s = Script.buildDataOut(data);
       should.exist(s);
-      s.toString().should.equal('OP_RETURN 0');
+      s.toString().should.equal('OP_RETURN');
       s.isDataOut().should.equal(true);
     });
     it('should create script from some data', function() {