diff --git a/scripts/internal_config.sh b/scripts/internal_config.sh
index 8cb59a9..b50cc2e 100644
--- a/scripts/internal_config.sh
+++ b/scripts/internal_config.sh
@@ -26,15 +26,15 @@ USED_LUKS=false
 # An array of disk related actions to perform
 DISK_ACTIONS=()
 # An associative array from disk id to a resolvable string
-declare -A DISK_ID_TO_RESOLVABLE
+declare -Ax DISK_ID_TO_RESOLVABLE
 # An associative from uuid to device
-declare -A DISK_UUID_TO_DEVICE
+declare -Ax DISK_UUID_TO_DEVICE
 # An associative array from disk id to parent gpt disk id (only for partitions)
-declare -A DISK_ID_PART_TO_GPT_ID
+declare -Ax DISK_ID_PART_TO_GPT_ID
 # An associative array to check for existing ids (maps to uuids)
-declare -A DISK_ID_TO_UUID
+declare -Ax DISK_ID_TO_UUID
 # An associative set to check for correct usage of size=remaining in gpt tables
-declare -A DISK_GPT_HAD_SIZE_REMAINING
+declare -Ax DISK_GPT_HAD_SIZE_REMAINING
 
 only_one_of() {
 	local previous=""
diff --git a/scripts/main.sh b/scripts/main.sh
index 610817f..be1bdcc 100755
--- a/scripts/main.sh
+++ b/scripts/main.sh
@@ -119,12 +119,12 @@ install_kernel_bios() {
 
 	# Install syslinux MBR record
 	einfo "Copying syslinux MBR record"
-	local biosdev="$(resolve_device_by_id "$DISK_ID_BIOS")"
 	local gptdev="$(resolve_device_by_id "${DISK_ID_PART_TO_GPT_ID[$DISK_ID_BIOS]}")"
 	try dd bs=440 conv=notrunc count=1 if=/usr/share/syslinux/gptmbr.bin of="$gptdev"
 
 	# Install syslinux
 	einfo "Installing syslinux"
+	local biosdev="$(resolve_device_by_id "$DISK_ID_BIOS")"
 	syslinux --install "$biosdev"
 }
 
diff --git a/scripts/utils.sh b/scripts/utils.sh
index 330f571..ab38ffb 100644
--- a/scripts/utils.sh
+++ b/scripts/utils.sh
@@ -138,12 +138,11 @@ get_device_by_uuid() {
 	get_device_by_blkid_field 'UUID' "$1"
 }
 
-get_device_by_ptuuid() {
-	echo -n "${DISK_UUID_TO_DEVICE[${1,,}]}"
-}
-
-get_device_by_mdadm_uuid() {
-	echo -n "${DISK_UUID_TO_DEVICE[${1,,}]}"
+get_device_by_stored_uuid() {
+	local key="${1,,}"
+	[[ -v "DISK_UUID_TO_DEVICE[$key]" ]] \
+		|| die "Could not resolve uuid $key to device"
+	echo -n "${DISK_UUID_TO_DEVICE[$key]}"
 }
 
 get_device_by_luks_uuid() {
@@ -203,11 +202,11 @@ resolve_device_by_id() {
 	local arg="${DISK_ID_TO_RESOLVABLE[$id]#*:}"
 
 	case "$type" in
-		'partuuid') get_device_by_partuuid   "$arg" ;;
-		'ptuuid')   get_device_by_ptuuid     "$arg" ;;
-		'uuid')     get_device_by_uuid       "$arg" ;;
-		'mdadm')    get_device_by_mdadm_uuid "$arg" ;;
-		'luks')     get_device_by_luks_uuid  "$arg" ;;
+		'partuuid') get_device_by_partuuid    "$arg" ;;
+		'ptuuid')   get_device_by_ptuuid      "$arg" ;;
+		'uuid')     get_device_by_uuid        "$arg" ;;
+		'mdadm')    get_device_by_stored_uuid "$arg" ;;
+		'luks')     get_device_by_stored_uuid "$arg" ;;
 		*) die "Cannot resolve '$type:$arg' to device (unknown type)"
 	esac
 }