diff --git a/Dockerfile b/Dockerfile
index 6fed7ee..432cd88 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,9 @@ COPY package.json package-lock.json* ./
 RUN npm install
 COPY . .
 ARG VITE_WIZARD_PORT=18080
+ARG VITE_WIZARD_HOST=wizard
 ENV VITE_WIZARD_PORT=$VITE_WIZARD_PORT
+ENV VITE_WIZARD_HOST=$VITE_WIZARD_HOST
 RUN npm run build
 
 # Production stage — lightweight static server, no nginx
diff --git a/src/App.tsx b/src/App.tsx
index d1d5982..b5a4c25 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -18,7 +18,8 @@ import MonitorPage from '@/pages/MonitorPage'
 import axios from 'axios'
 
 const WIZARD_PORT = Number(import.meta.env.VITE_WIZARD_PORT) || 18080
-const WIZARD_BASE = `http://127.0.0.1:${WIZARD_PORT}`
+const WIZARD_HOST = import.meta.env.VITE_WIZARD_HOST || "wizard"
+const WIZARD_BASE = `http://${WIZARD_HOST}:${WIZARD_PORT}`
 
 type AppState = 'checking' | 'setup' | 'ready'