diff --git a/lib/cfv/common.py b/lib/cfv/common.py
index 576cdab..aebb65f 100644
--- a/lib/cfv/common.py
+++ b/lib/cfv/common.py
@@ -1314,7 +1314,8 @@ def make_std_filename(filename):
     def make_chksumfile_create(self, filename):
         if config.announceurl is None:
             raise EnvironmentError('announce url required')
-        file = fileutil.open_write_raw(filename, config)
+        config.encoding = 'raw'
+        file = fileutil.open_write(filename, config)
         self.sh = hash.sha_new()
         self.files = []
         self.pieces = []