diff --git a/tests/test-issue2137.t b/tests/test-issue2137.t
--- a/tests/test-issue2137.t
+++ b/tests/test-issue2137.t
@@ -18,7 +18,7 @@ 1 and 2 are preconditions for the bug; 3
   >             tip1 = node.short(repo.changelog.tip())
   >             tip2 = node.short(repo.lookup(tip1))
   >             assert tip1 == tip2
-  >             ui.write('new tip: %s\n' % tip1)
+  >             ui.write(b'new tip: %s\n' % tip1)
   >             return result
   >     repo.__class__ = wraprepo
   >