diff -r c2e284cee333 -r eef9a2d67051 hgext/fastannotate/revmap.py
--- a/hgext/fastannotate/revmap.py	Sun Oct 06 13:17:19 2019 -0400
+++ b/hgext/fastannotate/revmap.py	Sun Oct 06 13:28:56 2019 -0400
@@ -13,6 +13,7 @@
 import struct
 
 from mercurial.node import hex
+from mercurial.pycompat import open
 from mercurial import (
     error as hgerror,
     pycompat,