diff --git a/lib/readline.js b/lib/readline.js
index 8200771ec4b39f..f1b9db46af6ee1 100644
--- a/lib/readline.js
+++ b/lib/readline.js
@@ -454,7 +454,7 @@ Interface.prototype._tabComplete = function(lastKeypressWasTab) {
 
 // this = Interface instance
 function handleGroup(self, group, width, maxColumns) {
-  if (group.length == 0) {
+  if (group.length === 0) {
     return;
   }
   var minRows = Math.ceil(group.length / maxColumns);
@@ -479,7 +479,7 @@ function handleGroup(self, group, width, maxColumns) {
 }
 
 function commonPrefix(strings) {
-  if (!strings || strings.length == 0) {
+  if (!strings || strings.length === 0) {
     return '';
   }
   if (strings.length === 1) return strings[0];
@@ -487,7 +487,7 @@ function commonPrefix(strings) {
   var min = sorted[0];
   var max = sorted[sorted.length - 1];
   for (var i = 0, len = min.length; i < len; i++) {
-    if (min[i] != max[i]) {
+    if (min[i] !== max[i]) {
       return min.slice(0, i);
     }
   }
@@ -702,7 +702,7 @@ Interface.prototype._ttyWrite = function(s, key) {
   this._previousKey = key;
 
   // Ignore escape key - Fixes #2876
-  if (key.name == 'escape') return;
+  if (key.name === 'escape') return;
 
   if (key.ctrl && key.shift) {
     /* Control and shift pressed */
@@ -783,7 +783,7 @@ Interface.prototype._ttyWrite = function(s, key) {
         break;
 
       case 'z':
-        if (process.platform == 'win32') break;
+        if (process.platform === 'win32') break;
         if (this.listenerCount('SIGTSTP') > 0) {
           this.emit('SIGTSTP');
         } else {
@@ -995,7 +995,7 @@ function emitKeypressEvents(stream, iface) {
   }
 
   function onNewListener(event) {
-    if (event == 'keypress') {
+    if (event === 'keypress') {
       stream.on('data', onData);
       stream.removeListener('newListener', onNewListener);
     }