diff --git a/orchard_sinsemilla.py b/orchard_sinsemilla.py
index 26b7afc..844d357 100755
--- a/orchard_sinsemilla.py
+++ b/orchard_sinsemilla.py
@@ -5,7 +5,7 @@ import math
 
 import orchard_iso_pallas
 
-from pyblake2 import blake2b, blake2s
+from pyblake2 import blake2b
 from orchard_pallas import Fp, p, q, PALLAS_B, Point
 from orchard_iso_pallas import PALLAS_ISO_B, PALLAS_ISO_A
 from sapling_utils import i2beosp, cldiv, beos2ip, i2leosp, lebs2ip