From 4257607e2b228fe886270c12679896d9b66876fe Mon Sep 17 00:00:00 2001
From: yexo <yexo@openttd.org>
Date: Wed, 6 Jan 2010 15:16:14 +0000
Subject: (svn r18742) -Fix [NewGRF]: house prop 1D was thrashed when a newgrf
 contains prop 14 after prop 1D

---
 src/newgrf.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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
-- 
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