diff --git a/app/assets/javascripts/discourse/components/lightbox.js b/app/assets/javascripts/discourse/components/lightbox.js
index cbd406d63..65947d05f 100644
--- a/app/assets/javascripts/discourse/components/lightbox.js
+++ b/app/assets/javascripts/discourse/components/lightbox.js
@@ -7,7 +7,6 @@
 **/
 Discourse.Lightbox = {
   apply: function($elem) {
-    var _this = this;
     $LAB.script("/javascripts/jquery.magnific-popup-min.js").wait(function() {
       $('a.lightbox', $elem).each(function(i, e) {
         $(e).magnificPopup({ type: 'image', closeOnContentClick: true });