--- a/hgext/mq.py	Sun Oct 06 13:17:19 2019 -0400
+++ b/hgext/mq.py	Sun Oct 06 13:28:56 2019 -0400
@@ -76,6 +76,7 @@
     nullrev,
     short,
 )
+from mercurial.pycompat import open
 from mercurial import (
     cmdutil,
     commands,