diff --git a/lib/tty.js b/lib/tty.js
index 54a7b756ec9544..c00f2f5e796b34 100644
--- a/lib/tty.js
+++ b/lib/tty.js
@@ -66,7 +66,7 @@ function WriteStream(fd) {
   // Ref: https://github.com/nodejs/node/pull/1771#issuecomment-119351671
   if (process.platform === 'darwin') this._handle.setBlocking(true);
 
-  var winSize = [];
+  var winSize = new Array(2);
   var err = this._handle.getWindowSize(winSize);
   if (!err) {
     this.columns = winSize[0];
@@ -83,7 +83,7 @@ WriteStream.prototype.isTTY = true;
 WriteStream.prototype._refreshSize = function() {
   var oldCols = this.columns;
   var oldRows = this.rows;
-  var winSize = [];
+  var winSize = new Array(2);
   var err = this._handle.getWindowSize(winSize);
   if (err) {
     this.emit('error', errnoException(err, 'getWindowSize'));