diff --git a/types/websocket.d.ts b/types/websocket.d.ts
index 6d81a2553b2..d48b9dadc01 100644
--- a/types/websocket.d.ts
+++ b/types/websocket.d.ts
@@ -169,6 +169,8 @@ interface WebSocketStream {
     writable: WritableStream
   }>
   url: string
+
+  close(options?: Partial<WebSocketCloseInfo>): void
 }
 
 export declare const WebSocketStream: {