diff --git a/quarry.lua b/quarry.lua
index 360a25f..9bf3da9 100644
--- a/quarry.lua
+++ b/quarry.lua
@@ -172,7 +172,7 @@ local function rectPrism(depth, width, length, leftFirst)
   Logger:trace("RectPrism:", depth, width, length)
   for _=1,depth do
     panel(width, length, leftFirst, checkRefuel, checkFullInv)
-    for __=1,2 do
+    for __=1,3 do
       while not turtle.down() do
         turtle.digDown()
         checkRefuel()