diff --git a/tests/dataconverter/test_helpers.py b/tests/dataconverter/test_helpers.py
index 535d9709d..8a6c57fd8 100644
--- a/tests/dataconverter/test_helpers.py
+++ b/tests/dataconverter/test_helpers.py
@@ -372,4 +372,4 @@ def test_warning_on_root_attribute_overwrite(caplog):
     assert error_text in caplog.text
 
     assert "/@NX_class" in template.keys()
-    assert template["/@NX_class"] == "NXroot"
\ No newline at end of file
+    assert template["/@NX_class"] == "NXroot"