diff --git a/addons/mass_mailing/static/src/js/mass_mailing_html_field.js b/addons/mass_mailing/static/src/js/mass_mailing_html_field.js
index b75a1ccd335..00a9d0c5ecf 100644
--- a/addons/mass_mailing/static/src/js/mass_mailing_html_field.js
+++ b/addons/mass_mailing/static/src/js/mass_mailing_html_field.js
@@ -601,6 +601,15 @@ export class MassMailingHtmlField extends HtmlField {
     async _getWysiwygClass() {
         return getWysiwygClass({moduleName: 'mass_mailing.wysiwyg'});
     }
+    /**
+     * @override
+     */
+    async _setupReadonlyIframe() {
+        if (!this.props.value.length) {
+            this.props.value = this.props.record.data.body_html;
+        }
+        await super._setupReadonlyIframe();
+    }
 }
 
 MassMailingHtmlField.props = {