diff --git a/docker/web/nginx.conf b/docker/web/nginx.conf
index d3fc926..3fb8035 100644
--- a/docker/web/nginx.conf
+++ b/docker/web/nginx.conf
@@ -11,7 +11,7 @@ server {
     # Proxy API requests to FastAPI (Docker bridge, service name)
     location /api/ {
         proxy_pass http://api:8522;
-        proxy_set_header Host $host;
+        proxy_set_header Host $http_host;
         proxy_set_header X-Real-IP $remote_addr;
     }
 }