diff --git a/opentech/apply/funds/models/mixins.py b/opentech/apply/funds/models/mixins.py
index 4e7828d3e70b73d7bd36c2c0617db82ee690fda3..849314bbbea269175bbaf7791a1f19a1a007b231 100644
--- a/opentech/apply/funds/models/mixins.py
+++ b/opentech/apply/funds/models/mixins.py
@@ -38,7 +38,7 @@ class AccessFormData:
 
     @classmethod
     def stream_file(cls, file):
-        if isinstance(file, StreamFieldFile, storage=submission_storage):
+        if isinstance(file, StreamFieldFile):
             return file
         if isinstance(file, File):
             return StreamFieldFile(file.file, name=file.name, storage=submission_storage)