diff --git a/index.js b/index.js
index 3a7cf08..97292fa 100644
--- a/index.js
+++ b/index.js
@@ -4,7 +4,7 @@ var cloneStats = require('clone-stats');
 var cloneBuffer = require('./lib/cloneBuffer');
 var removeTrailingSep = require('remove-trailing-separator');
 var isBuffer = require('./lib/isBuffer');
-var isStream = require('./lib/isStream');
+var isStream = require('is-stream');
 var isNull = require('./lib/isNull');
 var inspectStream = require('./lib/inspectStream');
 var normalize = require('./lib/normalize');
diff --git a/lib/inspectStream.js b/lib/inspectStream.js
index 942f23d..b9affed 100644
--- a/lib/inspectStream.js
+++ b/lib/inspectStream.js
@@ -1,4 +1,4 @@
-var isStream = require('./isStream');
+var isStream = require('is-stream');
 
 module.exports = function(stream) {
   if (!isStream(stream)) {
diff --git a/lib/isStream.js b/lib/isStream.js
deleted file mode 100644
index d2e8ac4..0000000
--- a/lib/isStream.js
+++ /dev/null
@@ -1,5 +0,0 @@
-var Stream = require('readable-stream').Stream;
-
-module.exports = function(o) {
-  return !!o && o instanceof Stream;
-};
diff --git a/package.json b/package.json
index 76e4304..061d68e 100644
--- a/package.json
+++ b/package.json
@@ -14,8 +14,8 @@
     "clone": "^1.0.0",
     "clone-stats": "^1.0.0",
     "cloneable-readable": "^0.5.0",
-    "readable-stream": "^2.1.0",
     "remove-trailing-separator": "^1.0.1",
+    "is-stream": "^1.1.0",
     "replace-ext": "^1.0.0"
   },
   "devDependencies": {
@@ -28,7 +28,8 @@
     "jscs": "^2.3.5",
     "jscs-preset-gulp": "^1.0.0",
     "mississippi": "^1.2.0",
-    "mocha": "^2.4.5"
+    "mocha": "^2.4.5",
+    "readable-stream": "^2.1.0"
   },
   "scripts": {
     "lint": "eslint . && jscs index.js lib/ test/",
diff --git a/test/is-stream.js b/test/is-stream.js
deleted file mode 100644
index 13bea85..0000000
--- a/test/is-stream.js
+++ /dev/null
@@ -1,37 +0,0 @@
-'use strict';
-
-var expect = require('expect');
-// Use node stream to test readable-stream inherits from it
-var Stream = require('stream');
-
-var isStream = require('../lib/isStream');
-
-describe('isStream()', function() {
-
-  it('returns true for a Stream', function(done) {
-    var testStream = new Stream();
-    var result = isStream(testStream);
-    expect(result).toEqual(true);
-    done();
-  });
-
-  it('returns false for a Buffer', function(done) {
-    var testBuffer = new Buffer('test');
-    var result = isStream(testBuffer);
-    expect(result).toEqual(false);
-    done();
-  });
-
-  it('returns false for null', function(done) {
-    var result = isStream(null);
-    expect(result).toEqual(false);
-    done();
-  });
-
-  it('returns false for an array of numbers', function(done) {
-    var testArray = [1, 2, 3];
-    var result = isStream(testArray);
-    expect(result).toEqual(false);
-    done();
-  });
-});