diff --git a/odoo/addons/base/module/wizard/base_import_language.py b/odoo/addons/base/module/wizard/base_import_language.py
index 9f7338ed592..aea906b8dc9 100644
--- a/odoo/addons/base/module/wizard/base_import_language.py
+++ b/odoo/addons/base/module/wizard/base_import_language.py
@@ -29,7 +29,7 @@ class BaseLanguageImport(models.TransientModel):
     def import_lang(self):
         this = self[0]
         this = this.with_context(overwrite=this.overwrite)
-        with TemporaryFile('w+b') as buf:
+        with TemporaryFile('wb+') as buf:
             try:
                 buf.write(base64.decodestring(this.data))