diff --git a/Dockerfile b/Dockerfile
index f691fed..309e9a9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,6 +14,10 @@ RUN --mount=type=cache,id=pnpm,target=/pnpm/store pnpm install --frozen-lockfile
 
 FROM build-deps AS build
 COPY . .
+
+ARG SITE_URL
+ENV SITE_URL=${SITE_URL}
+
 RUN pnpm run build
 
 FROM nginx:alpine AS runtime
diff --git a/Readme.md b/Readme.md
index a606822..4c84637 100644
--- a/Readme.md
+++ b/Readme.md
@@ -42,7 +42,7 @@ pnpm dev
 Production Build:
 
 ```sh
-sudo docker build -t astro-deploy .
+sudo docker build . --build-arg SITE_URL=https://example.com -t astro-deploy
 docker run -d -p 1234:80 astro-deploy
 ```
 
diff --git a/astro.config.mjs b/astro.config.mjs
index f651a5d..4ac052e 100644
--- a/astro.config.mjs
+++ b/astro.config.mjs
@@ -3,9 +3,11 @@ import react from '@astrojs/react';
 import sitemap from '@astrojs/sitemap';
 import tailwind from '@astrojs/tailwind';
 
+const SITE_URL = process.env.SITE_URL || 'https://astro.deployn.de';
+
 // https://astro.build/config
 export default defineConfig({
-	site: 'https://astro.deployn.de',
+	site: SITE_URL,
 	integrations: [
 		react(),
 		sitemap(),