diff --git a/modules/util/util.py b/modules/util/util.py
index c617978715fb62d6b9400311729d804a0df58593..5c53dd018196ea9420c05580baad3e3b73a53131 100644
--- a/modules/util/util.py
+++ b/modules/util/util.py
@@ -55,9 +55,9 @@ ds_range.update({'cloud_fraction': 'actual_range'})
 
 def get_fill_attrs(name):
     if name in ds_fill:
-        v, s = ds_fill[name]
+        v = ds_fill[name]
         if v is None:
-            return v, '_FillValue'
+            return None, '_FillValue'
         else:
             return v, None
     else: