diff --git a/back-end/src/controllers/box.controller.ts b/back-end/src/controllers/box.controller.ts
index ab75e5a..922f176 100644
--- a/back-end/src/controllers/box.controller.ts
+++ b/back-end/src/controllers/box.controller.ts
@@ -38,7 +38,7 @@ const allBoxesFromDate: RequestHandler<{ date: string; }> = async (req, res) =>
   res.render('boxes.ejs', { boxes });
 };
 
-const boxAddPieces: RequestHandler<{ title: string; }> = async (req, res) => {
+const boxAddPieces: RequestHandler<{ title: string|number; }> = async (req, res) => {
   const boxEither: Either<Box, string> = await boxService.getBox(req.params.title);
 
   if (boxEither.hasRight) {