diff --git a/numcodecs/compat.py b/numcodecs/compat.py
index c602d3a9..c5df5452 100644
--- a/numcodecs/compat.py
+++ b/numcodecs/compat.py
@@ -1,9 +1,7 @@
 # flake8: noqa
 import functools
-import sys
 import codecs
 import array
-from functools import reduce
 
 import numpy as np