diff --git a/src/video/haiku/SDL_BWin.h b/src/video/haiku/SDL_BWin.h
index f2f828734..830ebe247 100644
--- a/src/video/haiku/SDL_BWin.h
+++ b/src/video/haiku/SDL_BWin.h
@@ -250,6 +250,7 @@ class SDL_BWin:public BDirectWindow
 
     virtual void WindowActivated(bool active) {
         BMessage msg(BAPP_KEYBOARD_FOCUS);  /* Mouse focus sold separately */
+        msg.AddBool("focusGained", active);
         _PostWindowEvent(msg);
     }