How to change the resource limit notification threshold on OMV6

Event:       Resource limit matched
Description: space usage 88.2% matches resource limit [space usage > 85.0%]

I'd like to increase the limit to 95%. Already tried adding OMV_MONIT_SERVICE_FILESYSTEM_SPACEUSAGE=95 to /etc/default/openmediavault and effectuating it with

omv-salt stage run prepare

omv-salt deploy run monit

but even after a reboot I still get notification mails for >85%