diff --git a/src/client.ts b/src/client.ts
index 485ccae..d0dd0f9 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -98,7 +98,7 @@ export interface BareResponseFetch extends BareResponse {
 export class BareMuxConnection {
 	worker: WorkerConnection;
 
-	constructor(worker: string | Promise<MessagePort> | MessagePort) {
+	constructor(worker?: string | Promise<MessagePort> | MessagePort) {
 		this.worker = new WorkerConnection(worker);
 	}