diff --git a/polymer/eduke32/source/lunatic/bigytiles.lua b/polymer/eduke32/source/lunatic/bigytiles.lua
new file mode 100755
index 000000000..e2cbdb293
--- /dev/null
+++ b/polymer/eduke32/source/lunatic/bigytiles.lua
@@ -0,0 +1,16 @@
+#!/usr/bin/env luajit
+
+if (arg[1]==nil) then
+    print("Usage: "..arg[0].." ../path/to/*.ART")
+    return 1
+end
+
+B = require "build"
+
+tile = B.loadarts(arg)
+
+for i=0,B.MAX.TILES-1 do
+    if (tile.sizy[i] > 256) then
+        print(i..": "..tile.sizy[i])
+    end
+end
diff --git a/polymer/eduke32/source/lunatic/build.lua b/polymer/eduke32/source/lunatic/build.lua
index f40dcd6dc..46aabaf18 100644
--- a/polymer/eduke32/source/lunatic/build.lua
+++ b/polymer/eduke32/source/lunatic/build.lua
@@ -64,7 +64,7 @@ typedef struct
 local C = ffi.C
 
 
-local MAX =
+MAX =
 {
     SECTORS = { [7]=1024, [8]=4096, [9]=4096 },
     WALLS = { [7]=8192, [8]=16384, [9]=16384 },
@@ -343,7 +343,8 @@ function loadarts(filenames)
         end
 
         local localtilestart = cd[2]
-        local numtileshere = cd[3]-localtilestart
+        local numtileshere = cd[3]-localtilestart+1
+--        print(fn.. ": "..cd[2].. ", "..cd[3])
 
         if (numtileshere < 0 or localtilestart+numtileshere >= MAX.TILES) then
             fh:close()