diff --git a/minetest/boxes.lua b/minetest/boxes.lua
index c51d5ab..5d5a288 100644
--- a/minetest/boxes.lua
+++ b/minetest/boxes.lua
@@ -1,6 +1,6 @@
 -- Localize globals
-local assert, ipairs, math, minetest, pairs, table, type, vector
-	= assert, ipairs, math, minetest, pairs, table, type, vector
+local assert, ipairs, math, minetest, table, type, vector
+	= assert, ipairs, math, minetest, table, type, vector
 
 -- Set environment
 local _ENV = ...
@@ -48,7 +48,7 @@ local function get_node_boxes(pos, type)
 	if box_type == "leveled" then
 		boxes = table.copy(boxes)
 		local level = (paramtype2 == "leveled" and node.param2 or node_def.leveled or 0) / 255 - 0.5
-		for _, box in pairs(boxes) do
+		for _, box in ipairs(boxes) do
 			box[5] = level
 		end
 	elseif box_type == "wallmounted" then
@@ -92,7 +92,7 @@ local function get_node_boxes(pos, type)
 			matchers[i] = nodename_matcher(nodename_or_group)
 		end
 		local function connects_to(nodename)
-			for _, matcher in pairs(matchers) do
+			for _, matcher in ipairs(matchers) do
 				if matcher(nodename) then
 					return true
 				end
@@ -130,7 +130,7 @@ local function get_node_boxes(pos, type)
 			if axis == 2 then
 				sin = -sin
 			end
-			for _, box in pairs(boxes) do
+			for _, box in ipairs(boxes) do
 				for off = 0, 3, 3 do
 					local axis_1, axis_2 = other_axis_1 + off, other_axis_2 + off
 					local value_1, value_2 = box[axis_1], box[axis_2]