diff --git a/src/app/api/sales/batch-save/route.ts b/src/app/api/sales/batch-save/route.ts
index 68e3792..42b738c 100644
--- a/src/app/api/sales/batch-save/route.ts
+++ b/src/app/api/sales/batch-save/route.ts
@@ -63,8 +63,8 @@ export async function POST(req: NextRequest) {
         where: { code: { in: uniqueHotelCodes } }
       });
 
-      const userMap = new Map(dbUsers.map((u: any) => [u.username, u]));
-      const hotelMap = new Map(dbHotels.map((h: any) => [h.code, h]));
+      const userMap = new Map<string, any>(dbUsers.map((u: any) => [u.username, u]));
+      const hotelMap = new Map<string, any>(dbHotels.map((h: any) => [h.code, h]));
 
       // 3. Save records
       const createdSales = [];