diff --git a/lib/modem.js b/lib/modem.js
index b5f4cfd..c3c3c0c 100644
--- a/lib/modem.js
+++ b/lib/modem.js
@@ -464,8 +464,8 @@ Modem.prototype.demuxStream = function (streama, stdout, stderr) {
   }
 
   function bufferSlice(end) {
-    var out = buffer.slice(0, end);
-    buffer = Buffer.from(buffer.slice(end, buffer.length));
+    var out = buffer.subarray(0, end);
+    buffer = Buffer.from(buffer.subarray(end, buffer.length));
     return out;
   }