diff --git a/src/aircraft.h b/src/aircraft.h
--- a/src/aircraft.h
+++ b/src/aircraft.h
@@ -127,6 +127,7 @@ struct Aircraft : public Vehicle {
 	void Tick();
 	void OnNewDay();
 	TileIndex GetOrderStationLocation(StationID station);
+	bool FindClosestDepot(TileIndex *location, DestinationID *destination, bool *reverse);
 };
 
 #endif /* AIRCRAFT_H */