diff --git a/docker-compose.yml b/docker-compose.yml
index ec21ac2..172f7a8 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -174,13 +174,13 @@ services:
   frontend:
     <<: *customizable_image
     platform: linux/amd64
+    entrypoint: ['bash', '-c']
     command:
-      - nginx-entrypoint.sh
+      - export FRAPPE_SITE_NAME_HEADER=$$(tr -d '\r\n' < /home/frappe/frappe-bench/sites/currentsite.txt); exec nginx-entrypoint.sh
     environment:
       - SERVICE_FQDN_FRONTEND_8080
       - 'BACKEND=backend:8000'
       - 'SOCKETIO=websocket:9000'
-      - 'FRAPPE_SITE_NAME_HEADER=$$host'
       - 'UPSTREAM_REAL_IP_ADDRESS=${UPSTREAM_REAL_IP_ADDRESS:-127.0.0.1}'
       - 'UPSTREAM_REAL_IP_HEADER=${UPSTREAM_REAL_IP_HEADER:-X-Forwarded-For}'
       - 'UPSTREAM_REAL_IP_RECURSIVE=${UPSTREAM_REAL_IP_RECURSIVE:-off}'
diff --git a/docs/COOLIFY_DEPLOY.md b/docs/COOLIFY_DEPLOY.md
index c44d9d3..06fda5c 100644
--- a/docs/COOLIFY_DEPLOY.md
+++ b/docs/COOLIFY_DEPLOY.md
@@ -29,7 +29,7 @@ Copy from [`coolify.env.example`](../coolify.env.example). **Required before fir
 | `ADMIN_PASSWORD` | yes | Frappe `Administrator` password |
 | `INSTALL_APPS` | yes | `erpnext,payments,hrms,lending,lms` |
 | `SITE_NAME` | **no** (auto) | From Coolify domain via `SERVICE_FQDN_FRONTEND` |
-| `FRAPPE_SITE_NAME_HEADER` | **no** (auto) | Compose sets `$$host` — nginx uses incoming Host header |
+| `FRAPPE_SITE_NAME_HEADER` | **no** (auto) | Set at frontend start from `sites/currentsite.txt` |
 
 > **Coolify env cache:** If you previously set `SITE_NAME=erp.example.com` in Coolify, **delete it** so compose defaults use your real domain. Changing `docker-compose.yml` defaults alone does not update stored values.