diff --git a/overviewer_core/world.py b/overviewer_core/world.py
index 0f2e8a6..8660e07 100644
--- a/overviewer_core/world.py
+++ b/overviewer_core/world.py
@@ -925,10 +925,12 @@ class RegionSet(object):
             if p['east']  == 'true': data |= 8
         elif key.endswith('_stairs'):
             facing = palette_entry['Properties']['facing']
-            if   facing == 'south': data |= 0x60
-            elif facing == 'east':  data |= 0x30
-            elif facing == 'north': data |= 0x18
-            elif facing == 'west':  data |= 0x48
+            if   facing == 'south': data = 2
+            elif facing == 'east':  data = 0
+            elif facing == 'north': data = 3
+            elif facing == 'west':  data = 1
+            if palette_entry['Properties']['half'] == 'top':
+                data |= 0x4
         elif key.endswith('_door'):
             p = palette_entry['Properties']
             if p['hinge'] == 'left': data |= 0x10
@@ -947,7 +949,6 @@ class RegionSet(object):
         elif key in ['minecraft:beetroots', 'minecraft:melon_stem', 'minecraft:wheat',
                      'minecraft:pumpkin_stem', 'minecraft:potatoes', 'minecraft:carrots']:
             data = palette_entry['Properties']['age']
-
         return (block, data)
 
     def get_type(self):