diff --git a/src/town_cmd.cpp b/src/town_cmd.cpp
index cc8364b0a1..c486e427b3 100644
--- a/src/town_cmd.cpp
+++ b/src/town_cmd.cpp
@@ -1592,6 +1592,9 @@ static void GrowTownInTile(TileIndex *tile_ptr, RoadBits cur_rb, DiagDirection t
 			return;
 		}
 
+		/* 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();