--- a/hgext/remotefilelog/debugcommands.py	Sun Oct 06 13:17:19 2019 -0400
+++ b/hgext/remotefilelog/debugcommands.py	Sun Oct 06 13:28:56 2019 -0400
@@ -12,6 +12,7 @@
 
 from mercurial.node import bin, hex, nullid, short
 from mercurial.i18n import _
+from mercurial.pycompat import open
 from mercurial import (
     error,
     filelog,