diff --git a/services/dataService.ts b/services/dataService.ts
index 6a7273b..9048413 100644
--- a/services/dataService.ts
+++ b/services/dataService.ts
@@ -1,9 +1,10 @@
 
 import { Attendance, DashboardFilter, User } from '../types';
 
-// URL do Backend que criamos (backend/index.js)
-// Certifique-se de rodar o backend com 'node backend/index.js'
-const API_URL = 'http://localhost:3001/api'; 
+// URL do Backend
+// Em produção (import.meta.env.PROD), usa caminho relativo '/api' pois o backend serve o frontend
+// Em desenvolvimento, aponta para o localhost:3001
+const API_URL = import.meta.env.PROD ? '/api' : 'http://localhost:3001/api'; 
 
 export const getAttendances = async (tenantId: string, filter: DashboardFilter): Promise<Attendance[]> => {
   try {