diff --git a/scripts/install-usb.sh b/scripts/install-usb.sh
index 26c3c9b..d3e43f0 100755
--- a/scripts/install-usb.sh
+++ b/scripts/install-usb.sh
@@ -21,7 +21,7 @@ if lsblk -nr -o MOUNTPOINT "$DEVICE" | grep -q '[^[:space:]]'; then
  echo 'USB contains mounted partitions; unmount them before continuing.' >&2; lsblk "$DEVICE"; exit 2
 fi
 size_bytes=$(blockdev --getsize64 "$DEVICE")
-((size_bytes >= 16*1024*1024*1024)) || { echo 'USB must be at least 16 GiB.' >&2; exit 2; }
+((size_bytes >= 12*1024*1024*1024)) || { echo 'USB must be at least 12 GiB.' >&2; exit 2; }
 iso_bytes=$(stat -c %s "$ISO")
 ((iso_bytes < 4294967295)) || { echo 'ISO exceeds the FAT32 single-file limit.' >&2; exit 2; }
 model=$(lsblk -dn -o MODEL "$DEVICE" | xargs)