diff --git a/libs/turtle-utils.lua b/libs/turtle-utils.lua
index 2af9561..e48db71 100644
--- a/libs/turtle-utils.lua
+++ b/libs/turtle-utils.lua
@@ -14,7 +14,7 @@ turtleUtils.getInventory = function(side)
 end
 
 turtleUtils.getItemName = function(slotIndex)
-  local item = turtle.getItemDetail(i)
+  local item = turtle.getItemDetail(slotIndex)
   return item and item.name
 end
 
@@ -254,7 +254,7 @@ end
 
 -- Compact the internal turtle inventory (return the number of freed slots)
 turtleUtils.compactInventory = function()
-  local initialNbFreeSlots = turtle.countFreeSlots()
+  local initialNbFreeSlots = turtleUtils.countFreeSlots()
   local initialSelectedSlot = turtle.getSelectedSlot()
   local itemsMap = getItemsMap()
 
@@ -268,7 +268,7 @@ turtleUtils.compactInventory = function()
     turtle.select(initialSelectedSlot)
   end
 
-  return turtle.countFreeSlots() - initialNbFreeSlots
+  return turtleUtils.countFreeSlots() - initialNbFreeSlots
 end
 
 return turtleUtils
\ No newline at end of file