diff --git a/tests/test-ssh-proto-unbundle.t b/tests/test-ssh-proto-unbundle.t
--- a/tests/test-ssh-proto-unbundle.t
+++ b/tests/test-ssh-proto-unbundle.t
@@ -1,3 +1,10 @@
+persistent-nodemap is not enabled by default. It is not relevant for this test so disable it.
+
+  $ cat << EOF >> $HGRCPATH
+  > [format]
+  > use-persistent-nodemap = no
+  > EOF
+
   $ cat > hgrc-sshv2 << EOF
   > %include $HGRCPATH
   > [experimental]