diff --git a/src/newgrf.cpp b/src/newgrf.cpp

index ade7c00..de7a4e7 100644

--- a/src/newgrf.cpp

+++ b/src/newgrf.cpp

@@ -4262,7 +4262,7 @@ static ChangeInfoResult RoadTypeChangeInfo(uint id, int numinfo, int prop, ByteR

        }

 

        for (int i = 0; i < numinfo; i++) {

-               RoadTypeIdentifier rtid = RoadTypeIdentifier(_cur.grffile->roadtype_map[basetype][id + i]);

+               RoadTypeIdentifier rtid = RoadTypeIdentifier(basetype, (RoadSubType)_cur.grffile->roadtype_map[basetype][id + i]);

                if (!rtid.IsValid()) return CIR_INVALID_ID;

 

                RoadtypeInfo *rti = &_roadtypes[basetype][rtid.subtype];