diff --git a/lib/spack/spack/test/conftest.py b/lib/spack/spack/test/conftest.py
index e68dbd05f01..147d6edf4d0 100644
--- a/lib/spack/spack/test/conftest.py
+++ b/lib/spack/spack/test/conftest.py
@@ -1551,7 +1551,7 @@ def get_rev():
     yield t
 
 
-@pytest.fixture()
+@pytest.fixture(scope="function")
 def mutable_mock_env_path(tmpdir, mutable_config):
     """Fixture for mocking the internal spack environments directory."""
     saved_path = ev.environment.default_env_path