diff --git a/vines/init.lua b/vines/init.lua
index cfb9833..d95b556 100644
--- a/vines/init.lua
+++ b/vines/init.lua
@@ -18,6 +18,8 @@ minetest.register_craftitem("vines:vines", {
 
 -- FUNCTIONS
 
+local random = math.random
+
 local function dig_down(pos, node, digger)
 
 	if digger == nil then return end
@@ -80,7 +82,7 @@ vines.register_vine = function( name, defs, biome )
 
 			local timer = minetest.get_node_timer(pos)
 
-			timer:start(math.random(5, 10))
+			timer:start(random(5, 10))
 		end,
 
 		on_timer = function(pos)
@@ -91,7 +93,7 @@ vines.register_vine = function( name, defs, biome )
 
 			if bottom_node.name == "air" then
 
-				if not math.random(defs.average_length) == 1 then
+				if not random(defs.average_length) == 1 then
 
 					minetest.set_node(pos, {
 							name = vine_name_middle, param2 = node.param2})
@@ -101,7 +103,7 @@ vines.register_vine = function( name, defs, biome )
 
 					local timer = minetest.get_node_timer(bottom_node)
 
-					timer:start(math.random(5, 10))
+					timer:start(random(5, 10))
 				end
 			end
 		end,