diff --git a/.changeset/short-lemons-fold.md b/.changeset/short-lemons-fold.md
new file mode 100644
index 0000000000..a0223f699c
--- /dev/null
+++ b/.changeset/short-lemons-fold.md
@@ -0,0 +1,5 @@
+---
+'@astrojs/node': patch
+---
+
+fix port in standalone mode
diff --git a/packages/integrations/node/src/standalone.ts b/packages/integrations/node/src/standalone.ts
index e0435a2eab..18cf8a2a5c 100644
--- a/packages/integrations/node/src/standalone.ts
+++ b/packages/integrations/node/src/standalone.ts
@@ -35,7 +35,7 @@ export function getResolvedHostForHttpServer(host: string | boolean) {
 }
 
 export default function startServer(app: NodeApp, options: Options) {
-	const port = process.env.PORT ? Number(process.env.port) : options.port ?? 8080;
+	const port = process.env.PORT ? Number(process.env.PORT) : options.port ?? 8080;
 	const { client } = resolvePaths(options);
 	const handler = middleware(app);