diff --git a/modules/icing/util.py b/modules/icing/util.py
index 38f55ec0a946b2d3989bdca19b7f199a4a15bb53..e5f05873146013db8cf4ae7ecc99fc341436db5e 100644
--- a/modules/icing/util.py
+++ b/modules/icing/util.py
@@ -213,7 +213,7 @@ def run_icing_predict(clvrx_dir='/Users/tomrink/data/clavrx/RadC/', output_dir=h
 
         elif day_night == 'NIGHT':
             model_path = night_model_path
-            all_idxs = np.arange(num_lines * num_elems)
+            all_idxs = np.arange(num_lines * num_elems).tolist()
 
             mode = 'NIGHT'
             if use_dnb and lunar_illuminated:
@@ -234,6 +234,7 @@ def run_icing_predict(clvrx_dir='/Users/tomrink/data/clavrx/RadC/', output_dir=h
                                                                               prob_thresh=prob_thresh,
                                                                               use_flight_altitude=use_flight_altitude,
                                                                               flight_levels=flight_levels)
+            all_idxs = np.asarray(all_idxs)
             for flvl in flight_levels:
                 nght_preds = preds_nght_dct[flvl]
                 nght_probs = probs_nght_dct[flvl]