diff --git a/extract.js b/extract.js
index f6e7b51..3d682d1 100644
--- a/extract.js
+++ b/extract.js
@@ -3,6 +3,9 @@ var util = require('util');
 var bl = require('bl');
 var headers = require('./headers');
 
+var Writable = stream.Writable;
+var PassThrough = stream.PassThrough || require('readable-stream').PassThrough;
+
 var noop = function() {};
 
 var overflow = function(size) {
@@ -11,7 +14,7 @@ var overflow = function(size) {
 };
 
 var emptyStream = function() {
-	var s = new stream.PassThrough();
+	var s = new PassThrough();
 	s.end();
 	return s;
 };
@@ -24,7 +27,7 @@ var mixinPax = function(header, pax) {
 
 var Extract = function(opts) {
 	if (!(this instanceof Extract)) return new Extract(opts);
-	stream.Writable.call(this, opts);
+	Writable.call(this, opts);
 
 	this._buffer = bl();
 	this._missing = 0;
@@ -99,7 +102,7 @@ var Extract = function(opts) {
 			return;
 		}
 
-		self._stream = new stream.PassThrough();
+		self._stream = new PassThrough();
 
 		self.emit('entry', header, self._stream, onunlock);
 		self._parse(header.size, onstreamend);
@@ -109,7 +112,7 @@ var Extract = function(opts) {
 	this._parse(512, onheader);
 };
 
-util.inherits(Extract, stream.Writable);
+util.inherits(Extract, Writable);
 
 Extract.prototype.destroy = function(err) {
 	if (this._destroyed) return;
diff --git a/pack.js b/pack.js
index a4ad380..9b94edd 100644
--- a/pack.js
+++ b/pack.js
@@ -3,6 +3,9 @@ var util = require('util');
 var eos = require('end-of-stream');
 var headers = require('./headers');
 
+var Readable = stream.Readable;
+var Writable = stream.Writable;
+
 var END_OF_TAR = new Buffer(1024);
 END_OF_TAR.fill(0);
 
@@ -14,13 +17,13 @@ var overflow = function(self, size) {
 };
 
 var Sink = function(to) {
-	stream.Writable.call(this);
+	Writable.call(this);
 	this.written = 0;
 	this._to = to;
 	this._destroyed = false;
 };
 
-util.inherits(Sink, stream.Writable);
+util.inherits(Sink, Writable);
 
 Sink.prototype._write = function(data, enc, cb) {
 	this.written += data.length;
@@ -36,7 +39,7 @@ Sink.prototype.destroy = function() {
 
 var Pack = function(opts) {
 	if (!(this instanceof Pack)) return new Pack(opts);
-	stream.Readable.call(this, opts);
+	Readable.call(this, opts);
 
 	this._drain = noop;
 	this._finalized = false;
@@ -45,7 +48,7 @@ var Pack = function(opts) {
 	this._stream = null;
 };
 
-util.inherits(Pack, stream.Readable);
+util.inherits(Pack, Readable);
 
 Pack.prototype.entry = function(header, buffer, callback) {
 	if (this._stream) throw new Error('already piping an entry');