diff --git a/socket.io/socket.io.d.ts b/socket.io/socket.io.d.ts
index abc554c065..603079e5a1 100644
--- a/socket.io/socket.io.d.ts
+++ b/socket.io/socket.io.d.ts
@@ -47,7 +47,7 @@ interface SocketIOStatic {
 declare namespace SocketIO {
 
 	interface Server {
-		engine: { ws: WebSocketServer };
+		engine: { ws: any };
 		
 		/**
 		 * A dictionary of all the namespaces currently on this Server