diff --git a/account_bank_statement_import_ofx/wizard/account_bank_statement_import.py b/account_bank_statement_import_ofx/wizard/account_bank_statement_import.py
index 4258759..8944add 100644
--- a/account_bank_statement_import_ofx/wizard/account_bank_statement_import.py
+++ b/account_bank_statement_import_ofx/wizard/account_bank_statement_import.py
@@ -39,7 +39,7 @@ class AccountBankStatementImport(models.TransientModel):
         if not OfxParser:
             return False
         try:
-            ofx = OfxParser.parse(io.StringIO(data_file.decode('utf-8')))
+            ofx = OfxParser.parse(io.BytesIO(data_file))
         except Exception as e:
             _logger.debug(e)
             return False