diff --git a/modules/aeolus/aeolus_amv.py b/modules/aeolus/aeolus_amv.py
index 6b8e93f13b75fdf8ce15debe0ac62fd256e5b20f..4fedced4f6d86db3acc7907edb9bc8c93bc634e6 100644
--- a/modules/aeolus/aeolus_amv.py
+++ b/modules/aeolus/aeolus_amv.py
@@ -247,7 +247,7 @@ def create_file2(filename, raob_to_amv_dct, raob_dct, amv_files):
     rootgrp.close()
 
 
-def run_best_fit_driver(output_path, amv_dir, source, raob_path, gfs_path, product_dir, product):
+def run_best_fit_driver(output_path, amv_dir, source, raob_path, gfs_path, product_dir=None, product=None):
     amv_ds = get_datasource(amv_dir, source)
     gfs_files = get_datasource(gfs_path, 'GFS')
     raob_ds = get_datasource(raob_path, 'RAOB')