diff --git a/scripts/install-btrfs.sh b/scripts/install-btrfs.sh
index 0d306f5..28692c2 100644
--- a/scripts/install-btrfs.sh
+++ b/scripts/install-btrfs.sh
@@ -34,6 +34,8 @@ mount "${DISK}1" /mnt/boot
 
 echo "[5/7] Copying flake to /etc/nixos"
 mkdir -p /mnt/etc/nixos
+mkdir -p /mnt/tmp /mnt/var/tmp
+chmod 1777 /mnt/tmp /mnt/var/tmp
 if command -v rsync >/dev/null 2>&1; then
   rsync -a --exclude '.git' --exclude 'result' --exclude 'node_modules' "${REPO_ROOT}/" /mnt/etc/nixos/
 else