diff --git a/oml/changelog.py b/oml/changelog.py
index 55dc853..05296e0 100644
--- a/oml/changelog.py
+++ b/oml/changelog.py
@@ -47,7 +47,7 @@ def add_record(action, *args, **kwargs):
         state.changelog_size = 0
     makefolder(path)
     with open(path, mode) as fd:
-        fd.write(data + '\n')
+        fd.write(data + b'\n')
     state.changelog_size = os.path.getsize(path)
     #logger.debug('record change: %s', data)