diff --git a/hgext/hgk.py b/hgext/hgk.py
--- a/hgext/hgk.py
+++ b/hgext/hgk.py
@@ -358,7 +358,7 @@
 )
 def revlist(ui, repo, *revs, **opts):
     """print revisions"""
-    if opts[b'header']:
+    if opts['header']:
         full = b"commit"
     else:
         full = None