1 files changed, 4 insertions, 4 deletions

diff --git a/scripts/mkdisk.sh b/scripts/mkdisk.sh
index f9a8c09..6bdd50c 100755
--- a/scripts/mkdisk.sh
+++ b/scripts/mkdisk.sh
@@ -55,10 +55,10 @@ fi
 
 # mkfs.fat sizes are 1024-byte blocks; accept M/G/K suffixes too.
 case "$SIZE" in
-*G) SIZE_BLOCKS=$(( ${SIZE%G} * 1024 * 1024 )) ;;
-*M) SIZE_BLOCKS=$(( ${SIZE%M} * 1024 )) ;;
-*K) SIZE_BLOCKS=$(( ${SIZE%K} )) ;;
-*)      SIZE_BLOCKS="$SIZE" ;;
+*G) SIZE_BLOCKS=$((${SIZE%G} * 1024 * 1024)) ;;
+*M) SIZE_BLOCKS=$((${SIZE%M} * 1024)) ;;
+*K) SIZE_BLOCKS=$((${SIZE%K})) ;;
+*) SIZE_BLOCKS="$SIZE" ;;
 esac
 if [ -z "$SIZE_BLOCKS" ] || [ "$SIZE_BLOCKS" -le 0 ] 2>/dev/null; then
         echo "mkdisk: bad size '$SIZE' (use e.g. 64M or 65536)" >&2