diff --git a/app/assets/javascripts/merge_request_tabs.js.es6 b/app/assets/javascripts/merge_request_tabs.js.es6
index 771803edb7c123cefdf7e794f7f7d03d969fd822..3ec0f1fd613e553341e2820641621232f591dc23 100644
--- a/app/assets/javascripts/merge_request_tabs.js.es6
+++ b/app/assets/javascripts/merge_request_tabs.js.es6
@@ -225,7 +225,7 @@
 
       // We extract pathname for the current Changes tab anchor href
       // some pages like MergeRequestsController#new has query parameters on that anchor
-      var urlPathname = gl.utils.parseUrlPathname(source);
+      const urlPathname = gl.utils.parseUrlPathname(source);
 
       this.ajaxGet({
         url: `${urlPathname}.json${location.search}`,
diff --git a/spec/javascripts/merge_request_tabs_spec.js b/spec/javascripts/merge_request_tabs_spec.js
index 4facc42c5b4e735220ec78b481f9842a96ffcac7..130d391bfab30b15136b3982ef1058b7985e73a5 100644
--- a/spec/javascripts/merge_request_tabs_spec.js
+++ b/spec/javascripts/merge_request_tabs_spec.js
@@ -29,7 +29,7 @@
 
     describe('#activateTab', function () {
       beforeEach(function () {
-        spyOn($, 'ajax').and.callFake(function() {});
+        spyOn($, 'ajax').and.callFake(function () {});
         fixture.load('merge_request_tabs.html');
         this.subject = this.class.activateTab;
       });
@@ -53,7 +53,7 @@
 
     describe('#setCurrentAction', function () {
       beforeEach(function () {
-        spyOn($, 'ajax').and.callFake(function() {});
+        spyOn($, 'ajax').and.callFake(function () {});
         this.subject = this.class.setCurrentAction;
       });
       it('changes from commits', function () {
@@ -110,9 +110,9 @@
         expect(this.subject('show')).toBe('/foo/bar/merge_requests/1');
       });
     });
-    describe('#loadDiff', function() {
-      it('requires an absolute pathname', function() {
-        spyOn($, 'ajax').and.callFake(function(options) {
+    describe('#loadDiff', function () {
+      it('requires an absolute pathname', function () {
+        spyOn($, 'ajax').and.callFake(function (options) {
           expect(options.url).toEqual('/foo/bar/merge_requests/1/diffs.json');
         });
         this.class.loadDiff('/foo/bar/merge_requests/1/diffs');