diff --git a/docker-compose.aur-dev.yml b/docker-compose.aur-dev.yml
index 0b91dd93..aaa0d2ae 100644
--- a/docker-compose.aur-dev.yml
+++ b/docker-compose.aur-dev.yml
@@ -69,6 +69,8 @@ services:
       - data:/data
 
   nginx:
+    environment:
+      - NGINX_PROXY_PORT=443
     restart: always
     volumes:
       - data:/data
diff --git a/docker-compose.yml b/docker-compose.yml
index ebc760d4..f5001417 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -244,7 +244,8 @@ services:
     image: aurweb:latest
     init: true
     environment:
-      - AUR_CONFIG=conf/config
+      # Proxy toward FastAPI.
+      - NGINX_PROXY_PORT=8444
     entrypoint: /docker/nginx-entrypoint.sh
     command: /docker/scripts/run-nginx.sh
     ports:
diff --git a/docker/config/nginx.conf b/docker/config/nginx.conf
index b5c09d08..16421945 100644
--- a/docker/config/nginx.conf
+++ b/docker/config/nginx.conf
@@ -136,7 +136,7 @@ http {
 
         location / {
             proxy_pass http://asgi_backend;
-            proxy_set_header Host $http_host;
+            proxy_set_header Host HTTP_HOST;
             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
             proxy_set_header X-Forwarded-Proto $scheme;
             proxy_set_header X-Forwarded-Ssl on;
diff --git a/docker/nginx-entrypoint.sh b/docker/nginx-entrypoint.sh
index 1527cda7..be5675de 100755
--- a/docker/nginx-entrypoint.sh
+++ b/docker/nginx-entrypoint.sh
@@ -21,4 +21,8 @@ fi
 
 cp -vf /docker/config/nginx.conf /etc/nginx/nginx.conf
 
+# NGINX_PROXY_PORT must be defined for the `nginx` service
+# within `docker-compose.yml`.
+sed -i "s|HTTP_HOST|\$host:${NGINX_PROXY_PORT}|g" /etc/nginx/nginx.conf
+
 exec "$@"