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-rw-r--r--src/newgrf_house.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/newgrf_house.cpp b/src/newgrf_house.cpp
index 816ea513b..3179edbfd 100644
--- a/src/newgrf_house.cpp
+++ b/src/newgrf_house.cpp
@@ -255,7 +255,7 @@ static uint32 HouseGetVariable(const ResolverObject *object, byte variable, byte
case 0x40: return (IsTileType(tile, MP_HOUSE) ? GetHouseBuildingStage(tile) : 0) | TileHash2Bit(TileX(tile), TileY(tile)) << 2;
/* Building age. */
- case 0x41: return GetHouseAge(tile);
+ case 0x41: return IsTileType(tile, MP_HOUSE) ? GetHouseAge(tile) : 0;
/* Town zone */
case 0x42: return GetTownRadiusGroup(town, tile);