diff --git a/sabre/dav/lib/CalDAV/Principal/User.php b/sabre/dav/lib/CalDAV/Principal/User.php
index 6e97e7cca..c3887e6fd 100644
--- a/sabre/dav/lib/CalDAV/Principal/User.php
+++ b/sabre/dav/lib/CalDAV/Principal/User.php
@@ -118,6 +118,11 @@ function childExists($name) {
     function getACL() {
 
         $acl = parent::getACL();
+        $acl[] = [
+            'privilege' => '{DAV:}read',
+            'principal' => '{DAV:}authenticated',
+            'protected' => true,
+        ];
         $acl[] = [
             'privilege' => '{DAV:}read',
             'principal' => $this->principalProperties['uri'] . '/calendar-proxy-read',