diff --git a/apps/dav/appinfo/v1/caldav.php b/apps/dav/appinfo/v1/caldav.php
index 55046409b5830..9773375c397e5 100644
--- a/apps/dav/appinfo/v1/caldav.php
+++ b/apps/dav/appinfo/v1/caldav.php
@@ -29,6 +29,7 @@
 use OC\KnownUser\KnownUserService;
 use OCA\DAV\CalDAV\CalDavBackend;
 use OCA\DAV\CalDAV\CalendarRoot;
+use OCA\DAV\CalDAV\Principal\Collection as PrincipalCollection;
 use OCA\DAV\CalDAV\Security\RateLimitingPlugin;
 use OCA\DAV\CalDAV\Validation\CalDavValidatePlugin;
 use OCA\DAV\Connector\LegacyDAVACL;
@@ -83,7 +84,7 @@
 $sendInvitations = \OC::$server->getConfig()->getAppValue('dav', 'sendInvitations', 'yes') === 'yes';
 
 // Root nodes
-$principalCollection = new \Sabre\CalDAV\Principal\Collection($principalBackend);
+$principalCollection = new PrincipalCollection($principalBackend);
 $principalCollection->disableListing = !$debugging; // Disable listing
 
 $addressBookRoot = new CalendarRoot($principalBackend, $calDavBackend, 'principals', $logger);
diff --git a/apps/dav/appinfo/v1/carddav.php b/apps/dav/appinfo/v1/carddav.php
index 229a99f2e281f..6fc00b0ee70fc 100644
--- a/apps/dav/appinfo/v1/carddav.php
+++ b/apps/dav/appinfo/v1/carddav.php
@@ -30,6 +30,7 @@
 // Backends
 use OC\KnownUser\KnownUserService;
 use OCA\DAV\AppInfo\PluginManager;
+use OCA\DAV\CalDAV\Principal\Collection as PrincipalCollection;
 use OCA\DAV\CardDAV\AddressBookRoot;
 use OCA\DAV\CardDAV\CardDavBackend;
 use OCA\DAV\CardDAV\Security\CardDavRateLimitingPlugin;
@@ -71,7 +72,7 @@
 $debugging = \OC::$server->getConfig()->getSystemValue('debug', false);
 
 // Root nodes
-$principalCollection = new \Sabre\CalDAV\Principal\Collection($principalBackend);
+$principalCollection = new PrincipalCollection($principalBackend);
 $principalCollection->disableListing = !$debugging; // Disable listing
 
 $pluginManager = new PluginManager(\OC::$server, \OC::$server->query(IAppManager::class));