diff --git a/modules/icing/pirep_goes.py b/modules/icing/pirep_goes.py
index 60e0f96e647e71596449bd7767d1b093cc92e2d6..e13fccb7a4a74ffc94bc336aea7db5b675270142 100644
--- a/modules/icing/pirep_goes.py
+++ b/modules/icing/pirep_goes.py
@@ -967,6 +967,7 @@ def box_extract(outfile='/Users/tomrink/box_out.h5'):
         lst = icing_data_dct[ds_name]
         icing_data_dct[ds_name] = np.stack(lst, axis=0)
     icing_int_s = np.array(icing_int_s)
+    num_ice = icing_int_s.shape[0]
 
     num_no_ice = 0
     for fidx in range(len(no_icing_files)):