diff --git a/apps/dav/lib/Connector/Sabre/ZipFolderPlugin.php b/apps/dav/lib/Connector/Sabre/ZipFolderPlugin.php
index 26c185d7a0223..ea8c8d1b9b3f8 100644
--- a/apps/dav/lib/Connector/Sabre/ZipFolderPlugin.php
+++ b/apps/dav/lib/Connector/Sabre/ZipFolderPlugin.php
@@ -77,7 +77,10 @@ protected function streamNode(Streamer $streamer, NcNode $node, string $rootPath
 		}
 	}
 
-	public function handleDownload(Request $request, Response $response): null|false {
+	/**
+	 * @return false|null
+	 */
+	public function handleDownload(Request $request, Response $response): bool|null {
 		$node = $this->tree->getNodeForPath($request->getPath());
 		if (!($node instanceof \OCA\DAV\Connector\Sabre\Directory)) {
 			// only handle directories