diff --git a/server.ts b/server.ts
index f9db5da..5f1950a 100644
--- a/server.ts
+++ b/server.ts
@@ -67,7 +67,7 @@ const serverFactory = (handler, opts) => {
       } else if (shouldRouteRh(req)) {
         routeRhUpgrade(req, socket, head);
       } else if (req.url.endsWith("/wisp/")) {
-        wisp.routeRequest(req, socket as Socket, head);
+        wisp.routeRequest(req, socket, head);
       }
     });
 };