diff --git a/pycrostates/segmentation/_base.py b/pycrostates/segmentation/_base.py
index 47ba6c7e..3b06ff68 100644
--- a/pycrostates/segmentation/_base.py
+++ b/pycrostates/segmentation/_base.py
@@ -1,7 +1,7 @@
 """Segmentation module for segmented data."""
 
 import itertools
-from abc import ABC, abstractmethod
+from abc import abstractmethod
 from typing import List, Optional, Union
 
 import numpy as np