diff --git a/addons/web_editor/static/src/js/rte.js b/addons/web_editor/static/src/js/rte.js
index 37b87553506..c3a88007542 100644
--- a/addons/web_editor/static/src/js/rte.js
+++ b/addons/web_editor/static/src/js/rte.js
@@ -364,8 +364,8 @@ var RTE = Widget.extend({
                 var $el = $(this);
 
                 $el.find('[class]').filter(function () {
-                    if (!this.className.match(/\S/)) {
-                        this.removeAttribute("class");
+                    if (!this.getAttribute('class').match(/\S/)) {
+                        this.removeAttribute('class');
                     }
                 });