diff --git a/lib/Controller/APIv2Controller.php b/lib/Controller/APIv2Controller.php
index a584ddba4..45467716a 100644
--- a/lib/Controller/APIv2Controller.php
+++ b/lib/Controller/APIv2Controller.php
@@ -410,6 +410,7 @@ protected function getPreview(string $owner, int $fileId, string $filePath): arr
 					'y' => 250,
 					'fileId' => $fileId,
 					'c' => $fileInfo->getEtag(),
+					'mimeFallback' => 1,
 				];
 
 				$preview['source'] = $this->urlGenerator->linkToRouteAbsolute('core.Preview.getPreviewByFileId', $params);