diff --git a/lib/buffer.js b/lib/buffer.js
index 39cd5f9e58b9f8..a32484d3e36f0f 100644
--- a/lib/buffer.js
+++ b/lib/buffer.js
@@ -185,6 +185,7 @@ Buffer.isEncoding = function(encoding) {
       case 'utf16le':
       case 'utf-16le':
       case 'raw':
+      case 'raws':
         return true;
 
       default: