diff --git a/lib/crypto.js b/lib/crypto.js
index 2d0843356363a8..f8efffda483ec7 100644
--- a/lib/crypto.js
+++ b/lib/crypto.js
@@ -86,8 +86,7 @@ Hash.prototype._transform = function(chunk, encoding, callback) {
 };
 
 Hash.prototype._flush = function(callback) {
-  var encoding = this._readableState.encoding || 'buffer';
-  this.push(this._handle.digest(encoding), encoding);
+  this.push(this._handle.digest());
   callback();
 };