diff --git a/overviewer_core/world.py b/overviewer_core/world.py
index 286408b..1474a29 100644
--- a/overviewer_core/world.py
+++ b/overviewer_core/world.py
@@ -823,6 +823,13 @@ class RegionSet(object):
     def __repr__(self):
         return "<RegionSet regiondir=%r>" % self.regiondir
 
+    def __lt__(self, other):
+        """This garbage is only needed because genPOI wants to use
+        itertools.groupby, which needs sorted keys, and Python 2 somehow
+        just sorted objects like ???????? how????? why?????
+        """
+        return self.regiondir < other.regiondir
+
     def _get_block(self, palette_entry):
         wood_slabs = ('minecraft:oak_slab','minecraft:spruce_slab','minecraft:birch_slab','minecraft:jungle_slab',
                         'minecraft:acacia_slab','minecraft:dark_oak_slab','minecraft:petrified_oak_slab')