diff --git a/tests/data/slapd-deltasync-master.conf b/tests/data/slapd-deltasync-master.conf
index f3289f4a42..81105d1ef4 100644
--- a/tests/data/slapd-deltasync-master.conf
+++ b/tests/data/slapd-deltasync-master.conf
@@ -45,7 +45,7 @@ rootdn		"cn=Manager,dc=example,dc=com"
 #hdb#index		objectClass	eq
 #hdb#index		entryUUID,entryCSN	eq
 #ldbm#index		objectClass	eq
-#hdb#index		entryUUID,entryCSN	eq
+#ldbm#index		entryUUID,entryCSN	eq
 
 overlay syncprov
 syncprov-reloadhint true