diff --git a/js/binary/utils.js b/js/binary/utils.js
index df16249e..58f11b54 100644
--- a/js/binary/utils.js
+++ b/js/binary/utils.js
@@ -970,10 +970,6 @@ jspb.utils.byteSourceToUint8Array = function(data) {
     return /** @type {!Uint8Array} */(new Uint8Array(data));
   }
 
-  if (data.constructor === Buffer) {
-    return /** @type {!Uint8Array} */(new Uint8Array(data));
-  }
-
   if (data.constructor === Array) {
     data = /** @type {!Array.<number>} */(data);
     return /** @type {!Uint8Array} */(new Uint8Array(data));