diff --git a/tests/data/slapd-repl-slave.conf b/tests/data/slapd-repl-slave.conf
index ca81b76529..47c74aa3c5 100644
--- a/tests/data/slapd-repl-slave.conf
+++ b/tests/data/slapd-repl-slave.conf
@@ -18,3 +18,4 @@ updatedn	"cn=Manager, o=University of Michigan, c=US"
 index		cn,sn,uid	pres,eq,approx
 index		default		none
 lastmod		on
+dbcachenowsync