--- a/hgext/fastannotate/context.py	Sun Oct 06 13:17:19 2019 -0400
+++ b/hgext/fastannotate/context.py	Sun Oct 06 13:28:56 2019 -0400
@@ -13,6 +13,7 @@
 import os
 
 from mercurial.i18n import _
+from mercurial.pycompat import open
 from mercurial import (
     error,
     linelog as linelogmod,