diff --git a/mods/rp_core/border.lua b/mods/rp_core/border.lua
index aafbd98..12c6e7e 100644
--- a/mods/rp_core/border.lua
+++ b/mods/rp_core/border.lua
@@ -64,8 +64,22 @@ rp_core.area_vector = {
 }
 rp_core.area_size = (rp_core.area[2][1] - rp_core.area[1][1] + 1) * (rp_core.area[2][2] - rp_core.area[1][2] + 1)
 
-function rp_core.in_area(pos)
-    return vector.in_area(pos, rp_core.area_vector[1], rp_core.area_vector[2])
+if vector.in_area then
+    function rp_core.in_area(pos)
+        return vector.in_area(pos, rp_core.area_vector[1], rp_core.area_vector[2])
+    end
+else
+    function rp_core.in_area(pos)
+        local x, y, z = pos.x, pos.y, pos.z
+        if y ~= 1
+        or x < rp_core.area[1][1]
+        or x > rp_core.area[2][1]
+        or z < rp_core.area[1][2]
+        or z > rp_core.area[2][2] then
+            return false
+        end
+        return true
+    end
 end
 
 minetest.after(0,function()