diff --git a/miner.lua b/miner.lua
index 7266051..bcbd102 100644
--- a/miner.lua
+++ b/miner.lua
@@ -23,12 +23,12 @@ local robot = robotApi.create()
 
 local MAX_INVENTORY_BLOCKS = 16 * 64
 local ADDITIONAL_FUEL_NEEDED = 512
-local MIN_FUEL_NEEDED = (size * 2) + TARGET_Y + MAX_INVENTORY_BLOCKS + ADDITIONAL_FUEL_NEEDED
+local MIN_FUEL_NEEDED = (config.size * 2) + TARGET_Y + MAX_INVENTORY_BLOCKS + ADDITIONAL_FUEL_NEEDED
 
 local miner = {
   robot = robot,
   mission = 'unload', -- "unload" | "refuel" | "mine" | "return-home" | "return-mine" | nil
-  finished = false
+  finished = false,
   lastPositionState = nil -- { x, y, z, dir }
 }