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-rw-r--r--src/frontend/mame/ui/ui.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/frontend/mame/ui/ui.h b/src/frontend/mame/ui/ui.h
index 3baa5db61c2..03f32496e1a 100644
--- a/src/frontend/mame/ui/ui.h
+++ b/src/frontend/mame/ui/ui.h
@@ -135,7 +135,8 @@ enum class ui_callback_type
{
GENERAL,
MODAL,
- MENU
+ MENU,
+ VIEWER
};
// ======================> mame_ui_manager