diff --git a/node_modules/thrift/protocol.js b/node_modules/thrift/protocol.js
index 79dfdb7..b5e1ab8 100644
--- a/node_modules/thrift/protocol.js
+++ b/node_modules/thrift/protocol.js
@@ -123,16 +123,9 @@ TBinaryProtocol.prototype.writeDouble = function(dub) {
   this.trans.write(BinaryParser.fromDouble(dub));
 }
 
-TBinaryProtocol.prototype.writeString = function(arg) {
-  if (typeof(arg) === 'string') {
-    this.writeI32(Buffer.byteLength(arg, 'utf8'))
-    this.trans.write(arg, 'utf8');
-  } else if (arg instanceof Buffer) {
-    this.writeI32(arg.length)
-    this.trans.write(arg);
-  } else {
-    throw new Error('writeString called without a string/Buffer argument: ' + arg)
-  }
+TBinaryProtocol.prototype.writeString = function(str) {
+  this.writeI32(str.length);
+  this.trans.write(str);
 }
 
 TBinaryProtocol.prototype.readMessageBegin = function() {