diff --git a/filer/static/filer/js/addons/widget.js b/filer/static/filer/js/addons/widget.js
index 44972f558..65c614683 100644
--- a/filer/static/filer/js/addons/widget.js
+++ b/filer/static/filer/js/addons/widget.js
@@ -10,7 +10,6 @@ if (django.jQuery) {
 
 djQuery(function ($) {
     var filer_clear = function (ev) {
-        ev.preventDefault();
         var clearer = $(this);
         var container = clearer.closest('.filerFile');
         var input = container.find(':input');
@@ -21,6 +20,7 @@ djQuery(function ($) {
         var dropzoneMessage = container.siblings('.dz-message');
         var hiddenClass = 'hidden';
 
+        ev.preventDefault();
         clearer.addClass(hiddenClass);
         input.val('');
         thumbnail.addClass(hiddenClass);
diff --git a/tests/requirements/base.txt b/tests/requirements/base.txt
index e48dff237..6edaa2909 100644
--- a/tests/requirements/base.txt
+++ b/tests/requirements/base.txt
@@ -7,3 +7,4 @@ django-app-helper>=3.3.1
 coverage
 isort
 flake8
+packaging