userCertificate;binary in a 2.3.X ldif file

Can anyone shed any light on :

slapadd: could not parse entry (line=234)
str2entry: attributeType userCertificate #0: needs ';binary' transfer as per syntax 1.3.6.1.4.1.1466.115.121.1.8

This is ocurring when running 2.4.x slapadd on a certificate containing a binary attribute, which was a slapcat from a 2.3.X openldap server.

The attribute in question is already a binary attribute, there is a double colon after the certificate name, so i gather it just wants userCertificate;binary:: as the attribute name in the LDIF dump when loading ? Cant simply search and replace, because that will increase the line length, which will stop it from parsing.

Alternatively, anybody know of any tool which can re-justify line lengths in an ldif, if i search and replace the attribute name ?

It might be nice to have some sort of non-default legacy flag, for loading a previous release's ldif (or at least be more forgiving than the present parser)

Cheers
Brett