1diff --git a/tests/conftest.py b/tests/conftest.py
2index 62fb04f2e..bb5b279dd 100644
3--- a/tests/conftest.py
4+++ b/tests/conftest.py
5@@ -12,7 +12,6 @@ from typing import Any, AsyncIterator, Callable, Generator, Iterator
6 from unittest import mock
7 from uuid import uuid4
8
9-import isal.isal_zlib
10 import pytest
11 import zlib_ng.zlib_ng
12 from blockbuster import blockbuster_ctx
13@@ -333,7 +332,7 @@ def unused_port_socket() -> Generator[socket.socket, None, None]:
14 s.close()
15
16
17-@pytest.fixture(params=[zlib, zlib_ng.zlib_ng, isal.isal_zlib])
18+@pytest.fixture(params=[zlib, zlib_ng.zlib_ng])
19 def parametrize_zlib_backend(
20 request: pytest.FixtureRequest,
21 ) -> Generator[None, None, None]: