diff --git a/lib/Controller/LockController.php b/lib/Controller/LockController.php
index 2c2dd9c..976ab8e 100644
--- a/lib/Controller/LockController.php
+++ b/lib/Controller/LockController.php
@@ -153,7 +153,7 @@ private function buildOCSResponse($format, DataResponse $data) {
 		if ($data->getStatus() === Http::STATUS_LOCKED) {
 			/** @var FileLock $lock */
 			$lock = $data->getData();
-			$message = $this->l10n->t('File is currently locked by %s', [$lock->getOwner()]);
+			$message = $this->l10n->t('File is currently locked by %s', [$lock->getDisplayName()]);
 		}
 		if ($data->getStatus() === Http::STATUS_PRECONDITION_FAILED) {
 			/** @var FileLock $lock */