diff --git a/testing/test_meta.py b/testing/test_meta.py
index 7aa100e6e..296aa42aa 100644
--- a/testing/test_meta.py
+++ b/testing/test_meta.py
@@ -15,6 +15,7 @@ def _modules():
     )
 
 
+@pytest.mark.slow
 @pytest.mark.parametrize("module", _modules())
 def test_no_warnings(module):
     # fmt: off