diff --git a/app/assets/javascripts/merge_request.js.coffee b/app/assets/javascripts/merge_request.js.coffee
index d19f3af8c34..1fee9dc1892 100644
--- a/app/assets/javascripts/merge_request.js.coffee
+++ b/app/assets/javascripts/merge_request.js.coffee
@@ -125,7 +125,7 @@ class @MergeRequest
   loadDiff: (event) ->
     $.ajax
       type: 'GET'
-      url: this.$('.merge-request-tabs .diffs-tab a').attr('href')
+      url: this.$('.merge-request-tabs .diffs-tab a').attr('href') + ".json"
       beforeSend: =>
         this.$('.mr-loading-status .loading').show()
       complete: =>