diff --git a/activestorage/active.py b/activestorage/active.py
index 76c0230..a8e5845 100644
--- a/activestorage/active.py
+++ b/activestorage/active.py
@@ -137,7 +137,6 @@ def __init__(
                 raise TypeError(f"Variable object dataset can only be pyfive.high_level.Dataset. Got {dataset}")
             input_variable = True
             self.ds = dataset
-            self.filename = self.ds
         self.uri = dataset