diff --git a/minetest-dev.conf b/minetest-dev.conf
index 2057ac0..13f72f6 100644
--- a/minetest-dev.conf
+++ b/minetest-dev.conf
@@ -116,7 +116,8 @@ mg_flags = caves, dungeons, decorations
 #mg_biome_np_heat = 50, 50, (350,350,350), 5349, 3, 0.5, 2.0
 #mg_biome_np_humidity = 50, 50, (350,350,350), 842, 3, 0.5, 2.0
 mg_name = valleys
-mgvalleys_lava_depth = 1
+#mgvalleys_lava_depth = 1
+mgvalleys_large_cave_flooded = 0
 #mg_valleys_spflags = altitude_chill,humid_rivers
 #mgvalleys_altitude_chill = 90
 #mgvalleys_large_cave_depth = -33