diff --git a/addons/mass_mailing/static/src/js/mass_mailing_widget.js b/addons/mass_mailing/static/src/js/mass_mailing_widget.js
index 699796cef17..3d0858e09fb 100644
--- a/addons/mass_mailing/static/src/js/mass_mailing_widget.js
+++ b/addons/mass_mailing/static/src/js/mass_mailing_widget.js
@@ -160,6 +160,11 @@ var MassMailingFieldHtml = FieldHtml.extend({
         }
         return this._super.apply(this, arguments);
     },
+    _createWysiwygInstance: async function () {
+        const res = await this._super(...arguments);
+        this.wysiwyg.getEditable().find('img').attr('loading', '');
+        return res;
+    },
 
     /**
      * @override