diff --git a/src/api/export.ts b/src/api/export.ts
index ed601e4..b539aac 100644
--- a/src/api/export.ts
+++ b/src/api/export.ts
@@ -60,7 +60,8 @@ async function _export({
 		sander.copyFileSync(build_dir, 'service-worker.js.map').to(export_dir, 'service-worker.js.map');
 	}
 
-	const port = await ports.find(3000);
+	const defaultPort = process.env.PORT ? parseInt(process.env.PORT) : 3000;
+	const port = await ports.find(defaultPort);
 
 	const protocol = 'http:';
 	const host = `localhost:${port}`;
@@ -199,4 +200,4 @@ async function _export({
 function get_href(attrs: string) {
 	const match = /href\s*=\s*(?:"(.*?)"|'(.+?)'|([^\s>]+))/.exec(attrs);
 	return match[1] || match[2] || match[3];
-}
\ No newline at end of file
+}