diff --git a/src/script/api/script_airport.cpp b/src/script/api/script_airport.cpp
--- a/src/script/api/script_airport.cpp
+++ b/src/script/api/script_airport.cpp
@@ -77,7 +77,7 @@
 	EnforcePrecondition(false, IsValidAirportType(type));
 	EnforcePrecondition(false, station_id == ScriptStation::STATION_NEW || station_id == ScriptStation::STATION_JOIN_ADJACENT || ScriptStation::IsValidStation(station_id));
 
-	return ScriptObject::Command<CMD_BUILD_AIRPORT>::Do(tile, type, 0, (ScriptStation::IsValidStation(station_id) ? station_id : INVALID_STATION), station_id == ScriptStation::STATION_JOIN_ADJACENT);
+	return ScriptObject::Command<CMD_BUILD_AIRPORT>::Do(tile, type, 0, (ScriptStation::IsValidStation(station_id) ? station_id : INVALID_STATION), station_id != ScriptStation::STATION_JOIN_ADJACENT);
 }
 
 /* static */ bool ScriptAirport::RemoveAirport(TileIndex tile)