diff --git a/cdxj_indexer/postquery.py b/cdxj_indexer/postquery.py
index 01edbf8..911313c 100644
--- a/cdxj_indexer/postquery.py
+++ b/cdxj_indexer/postquery.py
@@ -105,7 +105,7 @@ def handle_binary(query_data):
 
         try:
             boundary = mime.split("boundary=")[1]
-            parser = MultipartParser(stream, boundary, charset="utf8")
+            parser = MultipartParser(BytesIO(query_data), boundary, charset="utf8")
         except (ValueError, IndexError):
             # Content-Type multipart/form-data may lack "boundary" info
             query = handle_binary(query_data)