diff --git a/src/LayServer.js b/src/LayServer.js
index a945680..14802fe 100644
--- a/src/LayServer.js
+++ b/src/LayServer.js
@@ -255,7 +255,7 @@ export default class LayServer extends BaseRouter {
 	 */
 	async listen(port = 8080, cb = () => {}) {
 		try {
-			this.proc = await Bun.serve({
+			this.#proc = await Bun.serve({
 				port,
 				development: Bun.env.BUN_ENV != 'production',
 				fetch: this.handleRequest.bind(this),
@@ -269,12 +269,12 @@ export default class LayServer extends BaseRouter {
 				},
 			});
 
-			if (!this.proc) {
+			if (!this.#proc) {
 				throw new Error('something went wrong');
 			}
 
 			if (!!cb && cb.constructor?.name.endsWith('Function')) {
-				cb(this.proc);
+				cb(this.#proc);
 			}
 		} catch (err) {
 			Logger.error('where', err.stack);