diff --git a/add-vm.sh b/add-vm.sh
index fc8abd0..8d12d71 100644
--- a/add-vm.sh
+++ b/add-vm.sh
@@ -32,7 +32,8 @@ warn() {
 [ -f "/etc/evolinux/add-vm.cnf" ] && . /etc/evolinux/add-vm.cnf
 masterKVMIP="${masterKVMIP:-127.0.0.1}"
 slaveKVMIP="${slaveKVMIP:-}"
-disks="${disks:-(ssd hdd)}"
+disks="${disks:-}"
+[ -n "${disks}" ] || disks=("ssd" "hdd")
 doDryRun=${doDryRun:-false}
 
 export DIALOGOUT=$(mktemp --tmpdir=/tmp addvm.XXX)