diff --git a/kwant/kpm.py b/kwant/kpm.py
index 967ba4f144fa6bde127d71c9d89ff76255790c0d..eb161de374b5a1276a7e2030b14a009cd7cd656c 100644
--- a/kwant/kpm.py
+++ b/kwant/kpm.py
@@ -8,7 +8,7 @@
 # http://kwant-project.org/authors.
 import math
 from operator import add
-from collections import Iterable
+from collections.abc import Iterable
 from functools import reduce
 import numpy as np
 from numpy.polynomial.chebyshev import chebval