--- a/hgext/strip.py	Sat Jun 17 15:05:11 2017 +0530
+++ b/hgext/strip.py	Sat Jun 17 15:29:26 2017 +0530
@@ -14,6 +14,7 @@
     lock as lockmod,
     merge,
     node as nodemod,
+    pycompat,
     registrar,
     repair,
     scmutil,
@@ -133,6 +134,7 @@
 
     Return 0 on success.
     """
+    opts = pycompat.byteskwargs(opts)
     backup = True
     if opts.get('no_backup') or opts.get('nobackup'):
         backup = False