diff --git a/tests/conftest.py b/tests/conftest.py
index 62fb04f2e..bb5b279dd 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -12,7 +12,6 @@ from typing import Any, AsyncIterator, Callable, Generator, Iterator
 from unittest import mock
 from uuid import uuid4
 
-import isal.isal_zlib
 import pytest
 import zlib_ng.zlib_ng
 from blockbuster import blockbuster_ctx
@@ -333,7 +332,7 @@ def unused_port_socket() -> Generator[socket.socket, None, None]:
         s.close()
 
 
-@pytest.fixture(params=[zlib, zlib_ng.zlib_ng, isal.isal_zlib])
+@pytest.fixture(params=[zlib, zlib_ng.zlib_ng])
 def parametrize_zlib_backend(
     request: pytest.FixtureRequest,
 ) -> Generator[None, None, None]: