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 d8caecceba2fa86386dc5060778a587ad3b0ae0f..f61987e869e66e614d79aa768b2ae40aad58a2f4 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
@@ -390,6 +390,7 @@ export class MassMailingHtmlField extends HtmlField {
                 }
                 // mark selection done for tour testing
                 $editable.addClass('theme_selection_done');
+                this.onIframeUpdated();
             }, 0);
         });