diff --git a/geminidr/gnirs/tests/crossdispersed/test_determine_wavelength_solution.py b/geminidr/gnirs/tests/crossdispersed/test_determine_wavelength_solution.py
index ef731a473..f868a56a0 100755
--- a/geminidr/gnirs/tests/crossdispersed/test_determine_wavelength_solution.py
+++ b/geminidr/gnirs/tests/crossdispersed/test_determine_wavelength_solution.py
@@ -69,7 +69,7 @@
     # 111 l/mm Shortblue SXD (north)
     "GN-2020B-Q-323": {
         "arc": ["N20210131S0104.fits"],
-        "flats": [f"N20210131S{i:04d}.fits" for i in range(92, 101)]
+        "flats": [f"N20210131S{i:04d}.fits" for i in range(92, 101)],
         "user_pars": {}
         },
     }