diff --git a/src/town_cmd.cpp b/src/town_cmd.cpp
index 1011af7c74..b0104910b5 100644
--- a/src/town_cmd.cpp
+++ b/src/town_cmd.cpp
@@ -668,7 +668,7 @@ static bool NeighborIsRoadTile(TileIndex tile, int dir, RoadBlockTitleDistance d
 
 static bool IsRoadAllowedHere(TileIndex tile, int dir)
 {
-	if (TileX(tile) < 1 || TileY(tile) < 1 || MapMaxX() >= TileX(tile) || MapMaxY() >= TileY(tile)) return false;
+	if (TileX(tile) < 1 || TileY(tile) < 1 || MapMaxX() <= TileX(tile) || MapMaxY() <= TileY(tile)) return false;
 
 	Slope k;
 	Slope slope;