diff --git a/df_caverns/underworld.lua b/df_caverns/underworld.lua
index 98fa6ba..706ca12 100644
--- a/df_caverns/underworld.lua
+++ b/df_caverns/underworld.lua
@@ -209,7 +209,7 @@ local get_pit = function(pos)
 	if region_mapblocks < 1 then return nil end
 
 	local corner_xz = get_corner(pos)
-	local next_seed = math.random(1, 1000000000)
+	local next_seed = math.random(1, 2^31)
 	math.randomseed(corner_xz.x + corner_xz.z * 2 ^ 8 + mapgen_seed)
 	local location = scatter_2d(corner_xz, pit_region_size, radius_pit_max + radius_pit_variance)
 	local variance_multiplier = math.random()
diff --git a/df_trees/blood_thorn.lua b/df_trees/blood_thorn.lua
index 403849c..2564f24 100644
--- a/df_trees/blood_thorn.lua
+++ b/df_trees/blood_thorn.lua
@@ -173,7 +173,7 @@ minetest.register_craft({
 
 -- This ensures consistent random maximum to bloodthorn growth
 local max_bloodthorn_height = function(pos)
-	local next_seed = math.random(1, 1000000000)
+	local next_seed = math.random(1, 2^31)
 	math.randomseed(pos.x + pos.z * 2 ^ 8)
 	local output = math.random(3,6)
 	math.randomseed(next_seed)