diff --git a/packages/rtl/web.pas b/packages/rtl/web.pas
index e5c0c96..f492e42 100644
--- a/packages/rtl/web.pas
+++ b/packages/rtl/web.pas
@@ -1664,6 +1664,9 @@ TEventListenerEvent = class external name 'EventListener_Event' (TJSObject)
     procedure clearWatch(AID : NativeInt);
   end;
 
+  TJSMediaStreamTrack = class external name 'MediaStreamTrack' (TJSEventTarget)
+  end;
+
   TJSMediaDevices = class external name 'MediaDevices' (TJSEventTarget)
   end;