diff --git a/src/WebsocketClient.re b/src/WebsocketClient.re
index a0066e1..238aff3 100644
--- a/src/WebsocketClient.re
+++ b/src/WebsocketClient.re
@@ -1,3 +1,9 @@
+module /*Open*/Event = {
+  type t;
+
+  include EventRe.Impl({ type nonrec t = t; });
+};
+
 module MessageEvent = {
   type t;
   type data('a);
@@ -70,14 +76,14 @@ module Websocket = {
 
   type t('msg) = {.
     [@bs.set] "binaryType": string,
-    [@bs.set] "onopen": MessageEvent.t => unit,
+    [@bs.set] "onopen": Event.t => unit,
     [@bs.set] "onerror": MessageEvent.t => unit,
     [@bs.set] "onclose": CloseEvent.t => unit,
     [@bs.set] "onmessage": MessageEvent.t => unit,
     "bufferedAmount": int,
     "url": string,
     "protocol": string,
-    "readyState": string,
+    "readyState": int,
     "extensions": string,
     [@bs.meth] "close": Js.Undefined.t(string) => Js.Undefined.t(string) => unit,
     [@bs.meth] "send": 'msg => unit