diff --git a/miner.lua b/miner.lua
index 43079f9..5ae0563 100644
--- a/miner.lua
+++ b/miner.lua
@@ -5,6 +5,8 @@ local nav = require("navigator")
 local scanner = require("scanner")
 local torch = require("torch")
 
+TORCH_INTERVAL = 9
+
 local function mine_single()
     robot.swing()
 
@@ -28,8 +30,8 @@ local function mine_n(count, place_torches)
             break
         end
 
-        -- place a torch every 11 blocks to keep the tunnel lit
-        if i % 11 == 0 and place_torches then
+        -- place a torch every x blocks to keep the tunnel lit
+        if i % TORCH_INTERVAL == 0 and place_torches then
             torch.place_torch(sides.right)
         end
     end
@@ -65,8 +67,8 @@ local function mine(scan_depth)
             robot.turnRight()
         end
 
-        -- place a torch every 11 blocks to keep the tunnel lit
-        if moved_rows % 11 == 0 then
+        -- place a torch every x blocks to keep the tunnel lit
+        if moved_rows % TORCH_INTERVAL == 0 then
             torch.place_torch(sides.left)
         end