diff --git a/install/updates/20-indices.update b/install/updates/20-indices.update
index d6df5b37d..cb1a11dd5 100644
--- a/install/updates/20-indices.update
+++ b/install/updates/20-indices.update
@@ -434,7 +434,7 @@ add:nsIndexType: eq
 add:nsIndexType: pres
 
 dn: cn=memberOf,cn=index,cn=userRoot,cn=ldbm database,cn=plugins,cn=config
-only:cn: member
+only:cn: memberOf
 add:nsIndexType: sub
 
 dn: cn=memberPrincipal,cn=index,cn=userRoot,cn=ldbm database,cn=plugins,cn=config