diff --git a/lib/private/Server.php b/lib/private/Server.php
index 8de4fa7d5ca..ba81074ae89 100644
--- a/lib/private/Server.php
+++ b/lib/private/Server.php
@@ -1174,7 +1174,7 @@ class Server extends ServerContainer implements IServerContainer {
 				$classExists = false;
 			}
 
-			if ($classExists && $c->get(\OCP\IConfig::class)->getSystemValueBool('installed', false) && $c->get(IAppManager::class)->isInstalled('theming') && $c->getTrustedDomainHelper()->isTrustedDomain($c->getRequest()->getInsecureServerHost())) {
+			if ($classExists && $c->get(\OCP\IConfig::class)->getSystemValueBool('installed', false) && $c->get(IAppManager::class)->isInstalled('theming') && $c->get(TrustedDomainHelper::class)->isTrustedDomain($c->getRequest()->getInsecureServerHost())) {
 				$imageManager = new ImageManager(
 					$c->get(\OCP\IConfig::class),
 					$c->getAppDataDir('theming'),