diff --git a/index.js b/index.js
index 2f69ae0..8468a07 100644
--- a/index.js
+++ b/index.js
@@ -1,4 +1,4 @@
-var Buffer = require('buffer').Buffer
+var isBuffer = require('is-buffer')
 
 module.exports = function (buf) {
 	// If the buffer is backed by a Uint8Array, a faster version will work
@@ -12,7 +12,7 @@ module.exports = function (buf) {
 		}
 	}
 
-	if (Buffer.isBuffer(buf)) {
+	if (isBuffer(buf)) {
 		// This is the slow version that will work with any Buffer
 		// implementation (even in old browsers)
 		var arrayCopy = new Uint8Array(buf.length)
diff --git a/package.json b/package.json
index fbfe6c0..a066b7b 100644
--- a/package.json
+++ b/package.json
@@ -30,5 +30,8 @@
   "devDependencies": {
     "tape": "^4.4.0",
     "zuul": "^3.9.0"
+  },
+  "dependencies": {
+    "is-buffer": "^1.1.1"
   }
 }