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-rw-r--r--src/vehicle_func.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/vehicle_func.h b/src/vehicle_func.h
index b4e1c0074..e61f6e233 100644
--- a/src/vehicle_func.h
+++ b/src/vehicle_func.h
@@ -60,7 +60,7 @@ byte GetBestFittingSubType(Vehicle *v_from, Vehicle *v_for, CargoID dest_cargo_t
void ViewportAddVehicles(DrawPixelInfo *dpi);
void ShowNewGrfVehicleError(EngineID engine, StringID part1, StringID part2, GRFBugs bug_type, bool critical);
-CommandCost TunnelBridgeIsFree(TileIndex tile, TileIndex endtile, const Vehicle *ignore = NULL);
+CommandCost TunnelBridgeIsFree(TileIndex tile, TileIndex endtile, const Vehicle *ignore = nullptr);
void DecreaseVehicleValue(Vehicle *v);
void CheckVehicleBreakdown(Vehicle *v);