diff --git a/gui/app.js b/gui/app.js
index 427ab021d..cbea6de2f 100644
--- a/gui/app.js
+++ b/gui/app.js
@@ -1064,12 +1064,6 @@ syncthing.filter('basename', function () {
     };
 });
 
-syncthing.filter('clean', function () {
-    return function (input) {
-        return encodeURIComponent(input).replace(/%/g, '');
-    };
-});
-
 syncthing.directive('optionEditor', function () {
     return {
         restrict: 'C',