diff --git a/world.py b/world.py
index 231287b..25157d1 100644
--- a/world.py
+++ b/world.py
@@ -147,10 +147,8 @@ class WorldRenderer(object):
         chunkY = spawnZ/16
 
         ## The filename of this chunk
-        chunkFile = "%s/%s/c.%s.%s.dat" % (base36encode(chunkX % 64), 
-                                           base36encode(chunkY % 64),
-                                           base36encode(chunkX),
-                                           base36encode(chunkY))
+        chunkFile = os.path.join(base36encode(chunkX % 64), base36encode(chunkY % 64),
+              "c.%s.%s.dat" % (base36encode(chunkX), base36encode(chunkY)))
 
 
         data=nbt.load(os.path.join(self.worlddir, chunkFile))[1]