--- a/town_cmd.c	Mon Jan 03 18:49:45 2005 +0000
+++ b/town_cmd.c	Mon Jan 03 18:59:58 2005 +0000
@@ -1410,7 +1410,7 @@
 				DoCommandByTile(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
 			}
 		}
-	} while (++tile != TILES_X * TILES_Y);
+	} while (++tile != MapSize());
 
 	t->xy = 0;
 	DeleteName(t->townnametype);