diff --git a/mods/bg_tree/decompose.lua b/mods/bg_tree/decompose.lua
index 8fdaf14..cd5bcd2 100644
--- a/mods/bg_tree/decompose.lua
+++ b/mods/bg_tree/decompose.lua
@@ -36,6 +36,7 @@ local decompose_scores = {
 }
 
 local decompose_cost = 30000
+local average_leaves_per_dirt = 4
 
 blockgame.register_increasing_abm({
 	id = modname .. ":decompose",
@@ -82,7 +83,7 @@ blockgame.register_increasing_abm({
 		local def = minetest.registered_nodes[node.name]
 		local dirt_chance = def.level_max - def.level + 1
 
-		if blockgame.chance(dirt_chance) then
+		if blockgame.chance(dirt_chance * average_leaves_per_dirt) then
 			minetest.set_node(pos, {name = "bg_terrain:dirt"})
 		else
 			minetest.remove_node(pos)