diff --git a/index.js b/index.js
index 9b3d1c7f..e7f66a50 100644
--- a/index.js
+++ b/index.js
@@ -77,7 +77,11 @@ function Buffer (subject, encoding, noZero) {
   } else if (type === 'object' && subject !== null) { // assume object is array-like
     if (subject.type === 'Buffer' && isArray(subject.data))
       subject = subject.data
-    length = +subject.length > 0 ? Math.floor(+subject.length) : 0
+    // Support ArrayBuffer subjects
+    if (subject.length === undefined && typeof subject.byteLength === 'number')
+      length = subject.byteLength
+    else  
+      length = +subject.length > 0 ? Math.floor(+subject.length) : 0
   } else
     throw new Error('First argument needs to be a number, array or string.')
 
diff --git a/test/basic.js b/test/basic.js
index 2f79d19a..6c913a07 100644
--- a/test/basic.js
+++ b/test/basic.js
@@ -138,6 +138,19 @@ test('new buffer from float64array', function (t) {
   t.end()
 })
 
+test('new buffer from ArrayBuffer', function(t) {
+  if (typeof ArrayBuffer !== 'undefined' && typeof DataView !== 'undefined') {
+    var b1 = new ArrayBuffer(2)
+    var dataView = new DataView(b1)
+    dataView.setInt16(0, 256, true)
+    var b2 = new B(b1)
+    t.equal(b1.byteLength, b2.length)
+    t.equal(b1[0], 0)
+    t.equal(b1[1], 1)
+  }
+  t.end()
+})
+
 test('buffer toArrayBuffer()', function (t) {
   var data = [1, 2, 3, 4, 5, 6, 7, 8]
   if (typeof Uint8Array !== 'undefined') {