diff --git a/lib/tools/isbinaryfile.js b/lib/tools/isbinaryfile.js
index 65f37fdf6..7b0135d08 100644
--- a/lib/tools/isbinaryfile.js
+++ b/lib/tools/isbinaryfile.js
@@ -18,7 +18,7 @@ module.exports = function(bytes, size) {
     }
     var descriptor = fs.openSync(file, 'r');
     try {
-      bytes = new Buffer(max_bytes);
+      bytes = Buffer.alloc(max_bytes);
       size = fs.readSync(descriptor, bytes, 0, bytes.length, 0);
     } finally {
       fs.closeSync(descriptor);
@@ -32,7 +32,7 @@ module.exports = function(bytes, size) {
 
       fs.open(file, 'r', function(err, descriptor){
         if (err) return callback(err);
-        var bytes = new Buffer(max_bytes);
+        var bytes = Buffer.alloc(max_bytes);
         // Read the file with no encoding for raw buffer access.
         fs.read(descriptor, bytes, 0, bytes.length, 0, function(err, size, bytes){
           fs.close(descriptor, function(err2){