diff --git a/init.lua b/init.lua
index e531425..51bd6ee 100644
--- a/init.lua
+++ b/init.lua
@@ -58,7 +58,7 @@ local chunk = {
 cartographer.skin = loadfile(modpath .. "/skin_api.lua") ();
 cartographer.gui = loadfile(modpath .. "/formspec.lua") ();
 loadfile(modpath .. "/scanner.lua") (map_data, chunk);
-loadfile(modpath .. "/map_api.lua") ();
+loadfile(modpath .. "/map_api.lua") (chunk);
 loadfile(modpath .. "/items.lua") ();
 _cartographer.generate_marker_formspec = loadfile(modpath .. "/marker_formspec.lua") (_cartographer.marker_lookup, cartographer.gui);
 loadfile(modpath .. "/map_formspec.lua") (map_data);
diff --git a/map_api.lua b/map_api.lua
index c23ccec..f07cb0e 100644
--- a/map_api.lua
+++ b/map_api.lua
@@ -1,3 +1,5 @@
+local chunk = ...;
+
 function cartographer.create_map(x, z, w, h, filled, detail, scale)
     local id = _cartographer.next_map_id;
 
@@ -92,10 +94,10 @@ end
 -- Returns The converted x and z coordinates
 function cartographer.to_map_coordinates(map, x, z)
     if not map or map.scale == 0 then
-        return tochunk(x), tochunk(z);
+        return chunk.to(x), chunk.to(z);
     end
 
-    return math.floor(tochunk(x) / map.scale + 0.5), math.floor(tochunk(z) / map.scale + 0.5);
+    return math.floor(chunk.to(x) / map.scale + 0.5), math.floor(chunk.to(z) / map.scale + 0.5);
 end
 
 -- Periodically-called function to fill in maps and queue chunks for manual
@@ -116,9 +118,9 @@ local function fill_loop()
             for i = -2,2 do
                 for j = -2,2 do
                     local adjusted_pos = {
-                        x = pos.x + fromchunk(i),
+                        x = pos.x + chunk.from(i),
                         y = pos.y,
-                        z = pos.z + fromchunk(j),
+                        z = pos.z + chunk.from(j),
                     }
                     cartographer.queue_region(adjusted_pos);
                 end
@@ -208,7 +210,6 @@ function cartographer.is_filled(map, x, z)
         return false;
     end
 
-    -- minetest.chat_send_all(tostring(x).. ", " .. tostring(z) .. "(" .. tostring(x + (z * map.w)) .."): " .. tostring(map.fill[x + (z * map.w)]));
     return map.fill[(x - map.x) + ((z - map.z) * map.w)] ~= nil;
 end
 
@@ -228,7 +229,9 @@ end
 -- Returns a string with a texture name, or nil if no matching biome entry was found.
 function cartographer.get_biome_texture(name, height, detail)
     for _,biome in ipairs(_cartographer.biome_lookup) do
-        if biome.name == name and (not biome.min_height or height >= biome.min_height) and (not biome.max_height or height <= biome.max_height) then
+        local matches_height = (not biome.min_height or height >= biome.min_height)
+                           and (not biome.max_height or height <= biome.max_height);
+        if biome.name == name and matches_height then
             return cartographer.detail_texture(biome.textures, detail);
         end
     end