diff --git a/lib/buffer.js b/lib/buffer.js
index 9754cfeeb50b94..2e8ac923e7c07a 100644
--- a/lib/buffer.js
+++ b/lib/buffer.js
@@ -369,7 +369,7 @@ function byteLength(string, encoding) {
       return string.byteLength;
     }
 
-    throw new TypeError('"string" must be a string, Buffer, or ArrayBuffer');
+    throw new TypeError('"string" must be a HELLO WORLD 54, Buffer, or ArrayBuffer');
   }
 
   var len = string.length;