diff --git a/apps/dav/lib/Connector/Sabre/Node.php b/apps/dav/lib/Connector/Sabre/Node.php
index 1d3773220f890..3ca542fee73ed 100644
--- a/apps/dav/lib/Connector/Sabre/Node.php
+++ b/apps/dav/lib/Connector/Sabre/Node.php
@@ -392,7 +392,7 @@ public function getNode(): \OCP\Files\Node {
 		return $this->node;
 	}
 
-	protected function sanitizeMtime($mtimeFromRequest) {
+	protected function sanitizeMtime(string $mtimeFromRequest): int {
 		return MtimeSanitizer::sanitizeMtime($mtimeFromRequest);
 	}
 }