diff --git a/test/server/proxy-option.test.js b/test/server/proxy-option.test.js
index 7044f71bd7..8ef40f1495 100644
--- a/test/server/proxy-option.test.js
+++ b/test/server/proxy-option.test.js
@@ -616,8 +616,12 @@ describe("proxy option", () => {
 
         beforeEach(
           () =>
-            new Promise((resolve) => {
-              ws = new WebSocket(`ws://localhost:${port3}/proxy3/socket`);
+            new Promise((resolve, reject) => {
+              ws = new WebSocket(`ws://localhost:${port3}/proxy3/socket`, {
+                origin: `http://localhost:${port3}`,
+              });
+
+              ws.on("error", reject);
 
               ws.on("message", (message) => {
                 responseMessage = message.toString();
diff --git a/types/lib/Server.d.ts b/types/lib/Server.d.ts
index eb9c96b51f..f49aefe5fe 100644
--- a/types/lib/Server.d.ts
+++ b/types/lib/Server.d.ts
@@ -1553,7 +1553,7 @@ declare class Server<
   private listeners;
   /**
    * @private
-   * @type {RequestHandler[]}
+   * @type {(() => RequestHandler | undefined)[]}
    */
   private webSocketProxies;
   /**