diff --git a/app/assets/javascripts/discourse/lib/utilities.js.es6 b/app/assets/javascripts/discourse/lib/utilities.js.es6
index 0385fa65550..ee160fb6fed 100644
--- a/app/assets/javascripts/discourse/lib/utilities.js.es6
+++ b/app/assets/javascripts/discourse/lib/utilities.js.es6
@@ -244,7 +244,7 @@ export function uploadLocation(url) {
   } else {
     var protocol = window.location.protocol + '//',
       hostname = window.location.hostname,
-      port = ':' + window.location.port;
+      port = window.location.port ? ':' + window.location.port : '';
     return protocol + hostname + port + url;
   }
 }