diff --git a/src/town_cmd.cpp b/src/town_cmd.cpp
index e9e72f1aec..b053ba242e 100644
--- a/src/town_cmd.cpp
+++ b/src/town_cmd.cpp
@@ -1623,6 +1623,9 @@ static TownGrowthResult GrowTownInTile(TileIndex *tile_ptr, RoadBits cur_rb, Dia
 			return TownGrowthResult::Continue;
 		}
 
+		/* Don't build houses around half-tile roads in the rare case we ended up on one. */
+		if (HasExactlyOneBit(cur_rb)) allow_house = false;
+
 		/* Possibly extend the road in a direction.
 		 * Randomize a direction and if it has a road, bail out. */
 		target_dir = RandomDiagDir();