diff --git a/lib/child_process.js b/lib/child_process.js
index 8460a732d9bf43..6cce1b09e5654b 100644
--- a/lib/child_process.js
+++ b/lib/child_process.js
@@ -142,8 +142,8 @@ function normalizeExecArgs(command, options, callback) {
 }
 
 
-exports.exec = function exec(command /* , options, callback */) {
-  var opts = normalizeExecArgs.apply(null, arguments);
+exports.exec = function exec(/* command , options, callback */) {
+  const opts = normalizeExecArgs.apply(null, arguments);
   return exports.execFile(opts.file,
                           opts.options,
                           opts.callback);