diff --git a/dist/src/instance.js b/dist/src/instance.js
index acb0af8..ca142e9 100644
--- a/dist/src/instance.js
+++ b/dist/src/instance.js
@@ -25,7 +25,7 @@ exports.createInstance = ({ app, server, options }) => {
     });
     app.use(options.path, api);
     //use mountpath for WS server
-    const customConfig = Object.assign(Object.assign({}, config), { path: path_1.default.join(app.path(), options.path, '/') });
+    const customConfig = Object.assign(Object.assign({}, config), { path: path_1.default.posix.join(app.path(), options.path, '/') });
     const wss = new webSocketServer_1.WebSocketServer({
         server,
         realm,
diff --git a/src/instance.ts b/src/instance.ts
index 798c339..1cd032e 100644
--- a/src/instance.ts
+++ b/src/instance.ts
@@ -34,7 +34,7 @@ export const createInstance = ({ app, server, options }: {
   app.use(options.path, api);
 
   //use mountpath for WS server
-  const customConfig = { ...config, path: path.join(app.path(), options.path, '/') };
+  const customConfig = { ...config, path: path.posix.join(app.path(), options.path, '/') };
 
   const wss: IWebSocketServer = new WebSocketServer({
     server,