diff --git a/src/hub/dataload/sources/unii/uploader.py b/src/hub/dataload/sources/unii/uploader.py
index f6ef975..2d18f50 100644
--- a/src/hub/dataload/sources/unii/uploader.py
+++ b/src/hub/dataload/sources/unii/uploader.py
@@ -16,7 +16,7 @@ class UniiUploader(biothings.hub.dataload.uploader.BaseSourceUploader):
     }
 
     idconverter = None
-    storage_class = biothings.hub.dataload.storage.IgnoreDuplicatedStorage
+    storage_class = biothings.utils.storage.IgnoreDuplicatedStorage
 
     def load_data(self, data_folder):
         self.logger.info("Load data from directory: '%s'" % data_folder)