diff --git a/mne/conftest.py b/mne/conftest.py
index 80380d1a387..17ff64b32f7 100644
--- a/mne/conftest.py
+++ b/mne/conftest.py
@@ -797,8 +797,6 @@ def mixed_fwd_cov_evoked(_evoked_cov_sphere, _all_src_types_fwd):
 
 
 @pytest.fixture(scope="session")
-@pytest.mark.slowtest
-@pytest.mark.parametrize(params=[testing._pytest_param()])
 def src_volume_labels():
     """Create a 7mm source space with labels."""
     pytest.importorskip("nibabel")
diff --git a/mne/source_space/tests/test_source_space.py b/mne/source_space/tests/test_source_space.py
index 4a1e20eef9b..a2648459fa6 100644
--- a/mne/source_space/tests/test_source_space.py
+++ b/mne/source_space/tests/test_source_space.py
@@ -679,6 +679,7 @@ def test_source_space_from_label(tmp_path, pass_ids):
     _compare_source_spaces(src, src_from_file, mode="approx")
 
 
+@pytest.mark.slowtest
 @testing.requires_testing_data
 def test_source_space_exclusive_complete(src_volume_labels):
     """Test that we produce exclusive and complete labels."""