diff --git a/frontend/src/api/dns.js b/frontend/src/api/dns.js
index e38adbe..6b9e8be 100644
--- a/frontend/src/api/dns.js
+++ b/frontend/src/api/dns.js
@@ -1,4 +1,8 @@
-const BASE = (process.env.REACT_APP_API_URL || 'http://localhost:3001') + '/api';
+// In development REACT_APP_API_URL points directly to the backend.
+// In Docker, leave it unset — nginx proxies /api to the backend container.
+const BASE = process.env.REACT_APP_API_URL
+  ? process.env.REACT_APP_API_URL + '/api'
+  : '/api';
 
 export function getToken() {
   return localStorage.getItem('dns_token');