diff --git a/lib/private/Files/ObjectStore/ObjectStoreStorage.php b/lib/private/Files/ObjectStore/ObjectStoreStorage.php
index 0328b728563a4..4050daddb35a7 100644
--- a/lib/private/Files/ObjectStore/ObjectStoreStorage.php
+++ b/lib/private/Files/ObjectStore/ObjectStoreStorage.php
@@ -465,6 +465,7 @@ public function writeStream(string $path, $stream, int $size = null): int {
 
 		$stat['mimetype'] = $mimetype;
 		$stat['etag'] = $this->getETag($path);
+		$stat['checksum'] = '';
 
 		$exists = $this->getCache()->inCache($path);
 		$uploadPath = $exists ? $path : $path . '.part';