diff --git a/src/haxe/net/WebSocket.hx b/src/haxe/net/WebSocket.hx
index 1572e82..139f752 100644
--- a/src/haxe/net/WebSocket.hx
+++ b/src/haxe/net/WebSocket.hx
@@ -75,6 +75,6 @@ class WebSocket {
     public dynamic function onmessageBytes(message:Bytes):Void {
     }
 
-    public dynamic function onclose():Void {
+    public dynamic function onclose(?e:Dynamic):Void {
     }
 }
diff --git a/src/haxe/net/impl/WebSocketJs.hx b/src/haxe/net/impl/WebSocketJs.hx
index d731e17..8dd1d11 100644
--- a/src/haxe/net/impl/WebSocketJs.hx
+++ b/src/haxe/net/impl/WebSocketJs.hx
@@ -32,7 +32,7 @@ class WebSocketJs extends WebSocket {
 			this.onopen();
 		};
 		impl.onclose = function(e:js.html.Event) {
-			this.onclose();
+			this.onclose(e);
 		};
 		impl.onerror = function(e:js.html.Event) {
 			this.onerror('error');