diff --git a/tests/test-chg.t b/tests/test-chg.t
--- a/tests/test-chg.t
+++ b/tests/test-chg.t
@@ -127,7 +127,7 @@
   > command = registrar.command(cmdtable)
   > @command(b'crash')
   > def pagercrash(ui, repo, *pats, **opts):
-  >     ui.write('going to crash\n')
+  >     ui.write(b'going to crash\n')
   >     raise Exception('.')
   > EOF