diff --git a/disk-deactivate/disk-deactivate b/disk-deactivate/disk-deactivate
index 7dcd753..c569690 100755
--- a/disk-deactivate/disk-deactivate
+++ b/disk-deactivate/disk-deactivate
@@ -3,4 +3,4 @@ set -efux
 # dependencies: jq util-linux lvm2 mdadm zfs
 disk=$1
 
-lsblk --output-all --json | jq -r --arg disk_to_clear "$disk" -f "$(dirname $0)/disk-deactivate.jq"
+lsblk --output-all --json | jq -r --arg disk_to_clear "$disk" -f "$(dirname "$0")/disk-deactivate.jq"