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-rw-r--r--src/aircraft.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/aircraft.h b/src/aircraft.h
index f020b2504..545464e52 100644
--- a/src/aircraft.h
+++ b/src/aircraft.h
@@ -53,7 +53,7 @@ static inline bool IsAircraftBuildableAtStation(EngineID engine, TileIndex tile)
const AirportFTAClass *apc = st->Airport();
const AircraftVehicleInfo *avi = AircraftVehInfo(engine);
- return apc->flags & (avi->subtype & AIR_CTOL ? AirportFTAClass::AIRPLANES : AirportFTAClass::HELICOPTERS);
+ return (apc->flags & (avi->subtype & AIR_CTOL ? AirportFTAClass::AIRPLANES : AirportFTAClass::HELICOPTERS)) != 0;
}
uint16 AircraftDefaultCargoCapacity(CargoID cid, const AircraftVehicleInfo*);