diff --git a/disk-deactivate/disk-deactivate b/disk-deactivate/disk-deactivate
index c569690..6f65ad8 100755
--- a/disk-deactivate/disk-deactivate
+++ b/disk-deactivate/disk-deactivate
@@ -1,6 +1,6 @@
 #!/bin/sh
 set -efux
 # dependencies: jq util-linux lvm2 mdadm zfs
-disk=$1
+disk=$(realpath "$1")
 
 lsblk --output-all --json | jq -r --arg disk_to_clear "$disk" -f "$(dirname "$0")/disk-deactivate.jq"