diff --git a/sapling_zip32.py b/sapling_zip32.py
index c7d7bfc..d0279bb 100644
--- a/sapling_zip32.py
+++ b/sapling_zip32.py
@@ -186,8 +186,8 @@ def main():
          'ak'  : bytes(k.ak()),
          'nk'  : bytes(k.nk()),
          'ivk' : bytes(k.ivk()),
-         'XSK' : Some(bytes(k)) if k.is_xsk() else None,
-         'XFVK': bytes(k.to_extended_fvk()),
+         'xsk' : Some(bytes(k)) if k.is_xsk() else None,
+         'xfvk': bytes(k.to_extended_fvk()),
          'fp'  : k.fingerprint(),
          'd0'  : option(k.diversifier(0)),
          'd1'  : option(k.diversifier(1)),
@@ -209,8 +209,8 @@ def main():
             ('ak',  '[u8; 32]'),
             ('nk',  '[u8; 32]'),
             ('ivk', '[u8; 32]'),
-            ('XSK', 'Option<[u8; 169]>'),
-            ('XFVK','[u8; 169]'),
+            ('xsk', 'Option<[u8; 169]>'),
+            ('xfvk','[u8; 169]'),
             ('fp',  '[u8; 32]'),
             ('d0',  'Option<[u8; 11]>'),
             ('d1',  'Option<[u8; 11]>'),