diff --git a/mods/legacy-initramfs/data/usr/local/bin/update-initramfs b/mods/legacy-initramfs/data/usr/local/bin/update-initramfs
index 2e6fc23..527b2ca 100755
--- a/mods/legacy-initramfs/data/usr/local/bin/update-initramfs
+++ b/mods/legacy-initramfs/data/usr/local/bin/update-initramfs
@@ -4,7 +4,7 @@ set -e
 for i in $(find /lib/modules -name "*.ko"); do
     if [ "$(file "$i"|grep ELF)" != "" ]; then
         >&2 echo "> $i ..."
-        xz -1 $i
+        xz -9 $i
         mv $i.xz $i
     fi
 done