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-rw-r--r--src/newgrf.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index 0b6130a72..fd2e52e58 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -1560,7 +1560,7 @@ static ChangeInfoResult TownHouseChangeInfo(uint hid, int numinfo, int prop, byt
break;
case 0x14: // House callback mask
- housespec->callback_mask = grf_load_byte(&buf);
+ housespec->callback_mask |= grf_load_byte(&buf);
break;
case 0x15: { // House override byte