diff --git a/apps/files_trashbin/lib/Helper.php b/apps/files_trashbin/lib/Helper.php
index 423f47a2b9da..c570a5f4d231 100644
--- a/apps/files_trashbin/lib/Helper.php
+++ b/apps/files_trashbin/lib/Helper.php
@@ -114,6 +114,7 @@ public static function formatFileInfos($fileInfos) {
 			$entry['id'] = $id++;
 			$entry['etag'] = $entry['mtime']; // add fake etag, it is only needed to identify the preview image
 			$entry['permissions'] = \OCP\Constants::PERMISSION_READ;
+			$entry['mimetype'] = \OC::$server->getMimeTypeDetector()->detectPath($entry['name']);
 			$files[] = $entry;
 		}
 		return $files;