diff --git a/src/town_cmd.cpp b/src/town_cmd.cpp
index 61ac6c8239..cc8364b0a1 100644
--- a/src/town_cmd.cpp
+++ b/src/town_cmd.cpp
@@ -2691,7 +2691,7 @@ static void BuildTownHouse(Town *t, TileIndex tile, const HouseSpec *hs, HouseID
 		uint32_t construction_random = Random();
 
 		construction_stage = TOWN_HOUSE_COMPLETED;
-		if (Chance16(1, 7)) construction_stage = GB(construction_random, 0, 2);
+		if (_generating_world && Chance16(1, 7)) construction_stage = GB(construction_random, 0, 2);
 
 		if (construction_stage == TOWN_HOUSE_COMPLETED) {
 			ChangePopulation(t, hs->population);