diff --git a/lib/writer.js b/lib/writer.js
index 27b4bc8e0..cfa87d57a 100644
--- a/lib/writer.js
+++ b/lib/writer.js
@@ -43,7 +43,7 @@ p.addCString = function(string) {
   } else {
     var len = Buffer.byteLength(string);
     this._ensure(len + 1); //+1 for null terminator
-    this.buffer.write(string, this.offset, len);
+    this.buffer.write(string, this.offset);
     this.offset += len;
   }
 
@@ -53,7 +53,7 @@ p.addCString = function(string) {
 
 p.addChar = function(char) {
   this._ensure(1);
-  this.buffer.write(char, this.offset, 1);
+  this.buffer.write(char, this.offset);
   this.offset++;
   return this;
 }