diff --git a/pyvela/tests/test_data_files.py b/pyvela/tests/test_data_files.py
index 0b4f4b1a..3ae88685 100644
--- a/pyvela/tests/test_data_files.py
+++ b/pyvela/tests/test_data_files.py
@@ -101,6 +101,8 @@ def test_data(model_and_toas):
         and len(spnta.param_labels) == spnta.ndim
     )
 
+    assert len(spnta.param_units) == spnta.ndim
+
 
 def test_chi2(model_and_toas):
     spnta: SPNTA