diff --git a/pyperformance/tests/data/find-pyperformance.py b/pyperformance/tests/data/find-pyperformance.py
index 2f6fa6c1..57c6e247 100644
--- a/pyperformance/tests/data/find-pyperformance.py
+++ b/pyperformance/tests/data/find-pyperformance.py
@@ -13,7 +13,7 @@
 testsroot = os.path.dirname(datadir)
 pkgroot = os.path.dirname(testsroot)
 reporoot = os.path.realpath(os.path.dirname(pkgroot))
-marker = os.path.join(reporoot, 'setup.py')
+marker = os.path.join(reporoot, 'pyproject.toml')
 if not os.path.exists(marker):
     sys.exit(f'ERROR: pyperformance is not an editable install ({reporoot})')
 actual = os.path.realpath(os.path.abspath(pyperformance.PKG_ROOT))
diff --git a/tox.ini b/tox.ini
index f9030b3b..12ab9b65 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,7 +13,7 @@ basepython = python3
 basepython = python3
 deps=
     sphinx
-whitelist_externals = make
+allowlist_externals = make
 commands=
     make -C doc clean html