Quarantine to gzip fails

I've set $QUARANTINEDIR in my conf, with most other configuration left at default values. Upon receiving spam, and trying to quarantine it, i receive the following error message:

<3>(03314-46) (!!)TROUBLE in check_mail: quar+notif FAILED: temporarily unable to quarantine: 451 4.5.0 Local delivery(1) to /var/amavis/quarantine/spam-kEiEdJ-T4iP7.gz failed: Can't locate object method "new" via package "Amavis::IO::Zlib" (perhaps you forgot to load "Amavis::IO::Zlib"?) at /usr/share/perl5/vendor_perl/Amavis/Out/Local.pm line 199., id=03314-46 at /usr/share/perl5/vendor_perl/Amavis.pm line 5576.
<4>(03314-46) (!)PRESERVING EVIDENCE in /var/amavis/amavis-20240930T072443-03314-Gi8kvYYa

Indeed, it seems that Amavis::IO::Zlib is not use-d.