diff --git a/bip-0352/reference.py b/bip-0352/reference.py
index 3d0899ce..40e69d08 100755
--- a/bip-0352/reference.py
+++ b/bip-0352/reference.py
@@ -7,7 +7,6 @@ import json
 from typing import List, Tuple, Dict, cast
 from sys import argv, exit
 from functools import reduce
-from itertools import permutations
 
 # local files
 from bech32m import convertbits, bech32_encode, decode, Encoding