diff --git a/addons/mail/static/src/models/message/message.js b/addons/mail/static/src/models/message/message.js
index c58106a361e..89aa93b5137 100644
--- a/addons/mail/static/src/models/message/message.js
+++ b/addons/mail/static/src/models/message/message.js
@@ -364,7 +364,7 @@ function factory(dependencies) {
          * @returns {boolean}
          */
         _computeCanStarBeToggled() {
-            return !this.isTemporary && !this.isTransient;
+            return !this.messaging.isCurrentUserGuest && !this.isTemporary && !this.isTransient;
         }
 
         /**