diff --git a/overviewer_core/world.py b/overviewer_core/world.py
index 8532924..c4354b8 100644
--- a/overviewer_core/world.py
+++ b/overviewer_core/world.py
@@ -499,6 +499,7 @@ class RotatedRegionSet(RegionSetWrapper):
                 array = numpy.swapaxes(array, 0,2)
                 section[arrayname] = array
         chunk_data['Sections'] = newsections
+        chunk_data['Biomes'] = numpy.rot90(chunk_data['Biomes'], self.north_dir)
         return chunk_data
 
     def get_chunk_mtime(self, x, z):