diff --git a/tests/test_units/test_dataio.py b/tests/test_units/test_dataio.py
index d35a3de82..ff2c17872 100644
--- a/tests/test_units/test_dataio.py
+++ b/tests/test_units/test_dataio.py
@@ -419,6 +419,7 @@ def test_unit_is_none(globalconfig1, regsurf):
     assert meta["data"]["unit"] == ""
 
 
+@pytest.mark.filterwarnings("ignore:Pydantic serializer warnings")
 def test_content_not_given(globalconfig1, regsurf):
     """When content is not explicitly given, warning shall be issued."""
     eobj = ExportData(config=globalconfig1)