diff --git a/debian/postinst b/debian/postinst
index adf49da6..2e6e145f 100644
--- a/debian/postinst
+++ b/debian/postinst
@@ -15,6 +15,8 @@ case "$1" in
 	fi
 	deb-systemd-invoke $_dh_action proxmox-backup.service proxmox-backup-proxy.service >/dev/null || true
 
+	flock -w 30 /etc/proxmox-backup/.datastore.lck sed -i '/^\s\+verify-schedule /d' /etc/proxmox-backup/datastore.cfg
+
 	# FIXME: Remove in future version once we're sure no broken entries remain in anyone's files
 	if grep -q -e ':termproxy::[^@]\+: ' /var/log/proxmox-backup/tasks/active; then
 	    echo "Fixing up termproxy user id in task log..."