diff --git a/lib/index.js b/lib/index.js
index ea67db9..3c1e04c 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -192,7 +192,7 @@ function OutBatch() {
 }
 
 OutBatch.prototype.append = function (buf, flags, cb) {
-  if (!Buffer.isBuffer(buf)) {
+  if (!Buffer.isBuffer(buf) && !(Uint8Array && buf instanceof Uint8Array)) {
     buf = new Buffer(String(buf), 'utf8');
   }