diff --git a/addons/web_editor/static/src/js/wysiwyg/widgets/media.js b/addons/web_editor/static/src/js/wysiwyg/widgets/media.js
index d9dfcdf2ae2..5a56faea8db 100644
--- a/addons/web_editor/static/src/js/wysiwyg/widgets/media.js
+++ b/addons/web_editor/static/src/js/wysiwyg/widgets/media.js
@@ -539,7 +539,7 @@ var FileWidget = SearchableMediaWidget.extend({
      * @param {boolean} isURL
      * @param {boolean} isImage
      */
-    _updateAddUrlUi(emptyValue, isURL, isImage) {
+    _updateAddUrlUi: function (emptyValue, isURL, isImage) {
         this.$addUrlButton.toggleClass('btn-secondary', emptyValue)
             .toggleClass('btn-primary', !emptyValue)
             .prop('disabled', !isURL);