diff --git a/modules/util/viirs_surfrad.py b/modules/util/viirs_surfrad.py
index 1acc0118c42f8c401f285da9d1affd96b10b643e..6a2722ca3437cfa831f86f5c951b48def2ac7150 100644
--- a/modules/util/viirs_surfrad.py
+++ b/modules/util/viirs_surfrad.py
@@ -151,7 +151,7 @@ def run_all(directory, out_directory, day_night='ANY', pattern='clavrx_*.nc', st
                     train_i = np.stack(train_tiles_i)
                     train_m = np.stack(train_tiles_m)
                     np.save(out_directory + 'train_ires_' + str(cnt), train_i)
-                    np.save(out_directory + 'train_mres' + str(cnt), train_m)
+                    np.save(out_directory + 'train_mres_' + str(cnt), train_m)
                     num_train_samples = train_m.shape[0]
 
                 valid_tiles_i = []