diff --git a/tests/test-wireproto-caching.t b/tests/test-wireproto-caching.t
--- a/tests/test-wireproto-caching.t
+++ b/tests/test-wireproto-caching.t
@@ -1,5 +1,10 @@
   $ . $TESTDIR/wireprotohelpers.sh
+
+persistent-nodemap is not enabled by default. It is not relevant for this test so disable it.
+
   $ cat >> $HGRCPATH << EOF
+  > [format]
+  > use-persistent-nodemap = no
   > [extensions]
   > blackbox =
   > [blackbox]