diff --git a/tests/functional/test_chart_factory.py b/tests/functional/test_chart_factory.py
index d37c03d..30b8abf 100644
--- a/tests/functional/test_chart_factory.py
+++ b/tests/functional/test_chart_factory.py
@@ -17,7 +17,7 @@
 )
 
 
-def test_get_chart_line_chart():
+def test_get_chart_line_chart(clean_env):
     """Test get_chart returns LineChart for d3-lines type."""
     # Create a mock Datawrapper client
     mock_client = MagicMock(spec=Datawrapper)