diff --git a/lib/util.js b/lib/util.js
index afddf439cf8e72..50f1e1b53138b3 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -640,10 +640,7 @@ function isPrimitive(arg) {
 }
 exports.isPrimitive = isPrimitive;
 
-function isBuffer(arg) {
-  return arg instanceof Buffer;
-}
-exports.isBuffer = isBuffer;
+exports.isBuffer = Buffer.isBuffer;
 
 function objectToString(o) {
   return Object.prototype.toString.call(o);