1 files changed, 1 insertions, 1 deletions

diff --git a/scripts/contrib/mkefidisk.sh b/scripts/contrib/mkefidisk.sh
index 0c15104bb3..bcc2411ca2 100755
--- a/scripts/contrib/mkefidisk.sh
+++ b/scripts/contrib/mkefidisk.sh
@@ -64,7 +64,7 @@ function device_details() {
                 echo "   model: UNKNOWN"
         fi
         if [ -f "/sys/class/block/$DEV/size" ]; then
-                echo "    size: $[$(cat /sys/class/block/$DEV/size)*BLOCK_SIZE] bytes"
+                echo "    size: $(($(cat /sys/class/block/$DEV/size) * $BLOCK_SIZE)) bytes"
         else
                 echo "    size: UNKNOWN"
         fi