diff --git a/apps/dav/appinfo/v1/caldav.php b/apps/dav/appinfo/v1/caldav.php
index 3d7d8766c0511..484ea4d4b0c65 100644
--- a/apps/dav/appinfo/v1/caldav.php
+++ b/apps/dav/appinfo/v1/caldav.php
@@ -31,6 +31,7 @@
 use OCA\DAV\CalDAV\Security\RateLimitingPlugin;
 use OCA\DAV\Connector\LegacyDAVACL;
 use OCA\DAV\CalDAV\CalendarRoot;
+use OCA\DAV\CalDAV\Principal\Collection as PrincipalCollection;
 use OCA\DAV\Connector\Sabre\Auth;
 use OCA\DAV\Connector\Sabre\ExceptionLoggerPlugin;
 use OCA\DAV\Connector\Sabre\MaintenancePlugin;
@@ -82,7 +83,7 @@
 $sendInvitations = \OC::$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 df759d57647e3..8a68079a16245 100644
--- a/apps/dav/appinfo/v1/carddav.php
+++ b/apps/dav/appinfo/v1/carddav.php
@@ -32,6 +32,7 @@
 use OCA\DAV\CardDAV\AddressBookRoot;
 use OCA\DAV\CardDAV\CardDavBackend;
 use OCA\DAV\CardDAV\Security\CardDavRateLimitingPlugin;
+use OCA\DAV\CalDAV\Principal\Collection as PrincipalCollection;
 use OCA\DAV\Connector\LegacyDAVACL;
 use OCA\DAV\Connector\Sabre\Auth;
 use OCA\DAV\Connector\Sabre\ExceptionLoggerPlugin;
@@ -69,7 +70,7 @@
 $debugging = \OC::$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));