--- a/landscape.c	Sat Jan 29 23:58:07 2005 +0000
+++ b/landscape.c	Sun Jan 30 08:25:39 2005 +0000
@@ -46,14 +46,14 @@
 	uint a,b,c,d,min;
 	int r;
 
+	assert(tile < MapSize());
+
 	if (TileX(tile) == MapMaxX() || TileY(tile) == MapMaxY()) {
 		if (h)
 			*h = 0;
 		return 0;
 	}
 
-	assert(tile < MapSize() && TileX(tile) != MapMaxX() && TileY(tile) != MapMaxY());
-
 	min = a = TileHeight(tile);
 	b = TileHeight(tile + TILE_XY(1,0));
 	if (min >= b) min = b;