OpenLDAP memberOf overlay - changing memberOf attribute name

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http://serverfault.com – I set up the memberOf overlay for OpenLDAP - how do I change the memberOf attribute name? I want to change it to "isMemberOf". I tried changing this attribute in the configuration olcMemberOfMemberOfAD: isMemberOf but ldapadd failed: ldap_add: Other (e.g., implementation specific) error (80) additional info: unable to find memberof attribute="isMemberOf": attribute type undefined (17) Any ideas? (HowTos)