diff --git a/tardis/plasma/tests/test_nlte_solver.py b/tardis/plasma/tests/test_nlte_solver.py
index 1095617d9d1..ab23a9cbd19 100644
--- a/tardis/plasma/tests/test_nlte_solver.py
+++ b/tardis/plasma/tests/test_nlte_solver.py
@@ -24,7 +24,8 @@ def test_rate_matrix():
             (2, 1, "nlte_ion"),
             (2, 2, "lte_ion"),
             ("n_e", "n_e", "n_e"),
-        ]
+        ],
+        names=('atomic_number', 'ion_number', 'level_number')
     )
 
     simple_photo_ion_rates = [0.03464792, 0.68099508]