diff --git a/test/conftest.py b/test/conftest.py
index e6a85d6..b8e73b5 100644
--- a/test/conftest.py
+++ b/test/conftest.py
@@ -1,7 +1,27 @@
+from __future__ import annotations
 import logging
 import pytest
 
 
+def pytest_addoption(parser: pytest.Parser) -> None:
+    parser.addoption(
+        "--oldsetup",
+        action="store_true",
+        default=False,
+        help="Run tests that require older setuptools",
+    )
+
+
+def pytest_collection_modifyitems(
+    config: pytest.Config, items: list[pytest.Item]
+) -> None:
+    if not config.getoption("--oldsetup"):
+        skipper = pytest.mark.skip(reason="Only run when --oldsetup is given")
+        for item in items:
+            if "oldsetup" in item.keywords:
+                item.add_marker(skipper)
+
+
 @pytest.fixture(autouse=True)
 def capture_all_logs(caplog: pytest.LogCaptureFixture) -> None:
     caplog.set_level(logging.DEBUG, logger="versioningit")
diff --git a/test/data/repos/git/default-version-bad.marks b/test/data/repos/git/default-version-bad.marks
index 40e6dd3..b5dca6c 100644
--- a/test/data/repos/git/default-version-bad.marks
+++ b/test/data/repos/git/default-version-bad.marks
@@ -1 +1,2 @@
 describe_exclude
+oldsetup
diff --git a/tox.ini b/tox.ini
index d50d4b9..fa8e72f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -28,7 +28,7 @@ deps =
     pytest-mock
     wheel
 commands =
-    pytest {posargs:-v} test
+    pytest {posargs:-v} --oldsetup test
 
 [testenv:lint]
 skip_install = True
@@ -58,6 +58,7 @@ addopts =
 filterwarnings = error
 markers =
     describe_exclude: Tests that use `git describe --exclude` (Added in Git 2.13.0)
+    oldsetup: Tests to only run under pre-v64 setuptools
 norecursedirs = test/data
 
 [coverage:run]