diff --git a/lib/bufferwriter.js b/lib/bufferwriter.js
index 5bf5800..d813bcb 100644
--- a/lib/bufferwriter.js
+++ b/lib/bufferwriter.js
@@ -2,7 +2,7 @@ var BN = require('./bn');
 
 var BufferWriter = function BufferWriter(obj) {
   if (!(this instanceof BufferWriter))
-    return new BufferReader(obj);
+    return new BufferWriter(obj);
   if (obj)
     this.set(obj);
   else