diff --git a/src/newgrf.h b/src/newgrf.h
--- a/src/newgrf.h
+++ b/src/newgrf.h
@@ -112,14 +112,14 @@ struct GRFFile : ZeroedMemoryAllocator {
 	uint sound_offset;
 	uint16 num_sounds;
 
-	struct StationSpec **stations;
-	struct HouseSpec **housespec;
-	struct IndustrySpec **industryspec;
-	struct IndustryTileSpec **indtspec;
-	struct ObjectSpec **objectspec;
-	struct AirportSpec **airportspec;
-	struct AirportTileSpec **airtspec;
-	struct RoadStopSpec **roadstops;
+	std::vector<struct StationSpec *> stations;
+	std::vector<struct HouseSpec *> housespec;
+	std::vector<struct IndustrySpec *> industryspec;
+	std::vector<struct IndustryTileSpec *> indtspec;
+	std::vector<struct ObjectSpec *> objectspec;
+	std::vector<struct AirportSpec *> airportspec;
+	std::vector<struct AirportTileSpec *> airtspec;
+	std::vector<struct RoadStopSpec *> roadstops;
 
 	uint32 param[0x80];
 	uint param_end;  ///< one more than the highest set parameter