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-rw-r--r--src/widgets/transparency_widget.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/widgets/transparency_widget.h b/src/widgets/transparency_widget.h
index 2b096e733..099d48a33 100644
--- a/src/widgets/transparency_widget.h
+++ b/src/widgets/transparency_widget.h
@@ -23,6 +23,7 @@ enum TransparencyToolbarWidgets {
WID_TT_STRUCTURES, ///< Object structure transparency toggle button.
WID_TT_CATENARY, ///< Catenary transparency toggle button.
WID_TT_LOADING, ///< Loading indicators transparency toggle button.
+ WID_TT_TUNNELS, ///< Vehicles in tunnels toggle button.
WID_TT_END, ///< End of toggle buttons.
/* Panel with buttons for invisibility */