diff --git a/lib/bufferreader.js b/lib/bufferreader.js
index a356999..19e0ee3 100644
--- a/lib/bufferreader.js
+++ b/lib/bufferreader.js
@@ -27,13 +27,10 @@ BufferReader.prototype.buffer = function(len) {
 };
 
 BufferReader.prototype.read = function(len) {
-  if (len) {
-    var buf = this.buf.slice(this.pos, this.pos + len);
-    this.pos = this.pos + len;
-    return buf;
-  }
-  var buf = this.buf.slice(this.pos);
-  this.pos = this.buf.length;
+  if (!len)
+    var len = this.buf.length;
+  var buf = this.buf.slice(this.pos, this.pos + len);
+  this.pos = this.pos + len;
   return buf;
 };