diff --git a/lib/_stream_writable.js b/lib/_stream_writable.js
index 02481739250635..f5f05486d233a9 100644
--- a/lib/_stream_writable.js
+++ b/lib/_stream_writable.js
@@ -249,9 +249,7 @@ function validChunk(stream, state, chunk, cb) {
 
   if (chunk === null) {
     er = new errors.TypeError('ERR_STREAM_NULL_VALUES');
-  } else if (typeof chunk !== 'string' &&
-             chunk !== undefined &&
-             !state.objectMode) {
+  } else if (typeof chunk !== 'string' && !state.objectMode) {
     er = new errors.TypeError('ERR_INVALID_ARG_TYPE', 'chunk',
                               ['string', 'Buffer']);
   }
diff --git a/lib/net.js b/lib/net.js
index f962a848fad662..5562db6ed61e38 100644
--- a/lib/net.js
+++ b/lib/net.js
@@ -701,17 +701,6 @@ protoGetter('localPort', function localPort() {
 });
 
 
-Socket.prototype.write = function(chunk, encoding, cb) {
-  if (typeof chunk !== 'string' && !(chunk instanceof Buffer)) {
-    throw new errors.TypeError('ERR_INVALID_ARG_TYPE',
-                               'chunk',
-                               ['string', 'Buffer'],
-                               chunk);
-  }
-  return stream.Duplex.prototype.write.apply(this, arguments);
-};
-
-
 Socket.prototype._writeGeneric = function(writev, data, encoding, cb) {
   // If we are still connecting, then buffer this for later.
   // The Writable logic will buffer up any more writes while