diff --git a/bin/serve.js b/bin/serve.js
index d719e9ed..08557add 100755
--- a/bin/serve.js
+++ b/bin/serve.js
@@ -335,7 +335,7 @@ const loadConfig = async (cwd, entry, args) => {
 
 	if (!args['--listen']) {
 		// Default endpoint
-		args['--listen'] = [[5000]];
+		args['--listen'] = [[process.env.PORT || 5000]];
 	}
 
 	if (args._.length > 1) {