diff --git a/amaranth/lib/data.py b/amaranth/lib/data.py
index ec41029..24bbde4 100644
--- a/amaranth/lib/data.py
+++ b/amaranth/lib/data.py
@@ -1,4 +1,4 @@
-from abc import ABCMeta, abstractmethod, abstractproperty
+from abc import ABCMeta, abstractmethod
 from collections.abc import Mapping, Sequence
 import warnings