diff --git a/lib/net.js b/lib/net.js
index 92b04838b6178d..957035c4724ef8 100644
--- a/lib/net.js
+++ b/lib/net.js
@@ -1416,8 +1416,7 @@ Server.prototype.listen = function(...args) {
     throw new ERR_SERVER_ALREADY_LISTEN();
   }
 
-  var hasCallback = (cb !== null);
-  if (hasCallback) {
+  if (cb !== null) {
     this.once('listening', cb);
   }
   var backlogFromArgs =
@@ -1704,7 +1703,7 @@ if (process.platform === 'win32') {
     }
   };
 } else {
-  _setSimultaneousAccepts = function(handle) {};
+  _setSimultaneousAccepts = function() {};
 }
 
 module.exports = {