diff --git a/ghost/portal/src/App.js b/ghost/portal/src/App.js
index 23f27f9ac2..e5de7e988d 100644
--- a/ghost/portal/src/App.js
+++ b/ghost/portal/src/App.js
@@ -57,7 +57,6 @@ export default class App extends React.Component {
         if (this.state.initStatus === 'success' && prevState.initStatus !== this.state.initStatus) {
             const {siteUrl} = this.props;
             const contextState = this.getContextFromState();
-            this.sendPortalReadyEvent(siteUrl);
             handleDataAttributes({
                 siteUrl,
                 site: contextState.site,
@@ -74,14 +73,6 @@ export default class App extends React.Component {
         });
     }
 
-    sendPortalReadyEvent(siteUrl) {
-        const siteOrigin = ((new URL(siteUrl)).origin).replace(/\/$/, '');
-
-        if (window.self !== window.parent) {
-            window.parent.postMessage('portal-ready', siteOrigin);
-        }
-    }
-
     /** Setup custom trigger buttons handling on page */
     setupCustomTriggerButton() {
         // Handler for custom buttons