diff --git a/modules/aeolus/aeolus_amv.py b/modules/aeolus/aeolus_amv.py
index 350e20f9fc0f992167545a3f627488e7f4db0356..0e70081d6597396e3169a6ef554d5513561fec5b 100644
--- a/modules/aeolus/aeolus_amv.py
+++ b/modules/aeolus/aeolus_amv.py
@@ -265,6 +265,7 @@ def run_best_fit_driver(amv_dir, source, raob_path, gfs_path, product_dir, produ
 
     for k, file in enumerate(raob_files):
         raob_dct = get_raob_dict_cdf(file)
+        keys = list(raob_dct.keys())
         ts = raob_ds.ftimes[k,0]
         m_d = match_amvs_to_raobs(raob_dct, ts, amv_files)
         if m_d is None: