diff --git a/xray/id9.py b/xray/id9.py
index 683f29e..4bbe6c5 100644
--- a/xray/id9.py
+++ b/xray/id9.py
@@ -51,7 +51,7 @@ def doFolder_dataRed(azavStorage,monitor=None,funcForAveraging=np.nanmean,
 
   if isinstance(azavStorage,storage.DataStorage):
     data = azavStorage
-    folder = os.path.dirname(data.filename) if data.filename is not None else "./"
+    folder = azavStorage.folder
   elif os.path.isfile(azavStorage):
     folder = os.path.dirname(azavStorage)
     data = storage.DataStorage(azavStorage)