diff --git a/lz4 b/lz4
new file mode 100755
index 0000000..d28446b
Binary files /dev/null and b/lz4 differ
diff --git a/mkboot b/mkboot
index 6105132..7f66777 100755
--- a/mkboot
+++ b/mkboot
@@ -247,7 +247,14 @@ ramdisk_offset=$ramdisk_offset\ntags_offset=$tags_offset\ncmd_line=\"$cmd_line\"
     fi
     mkdir ramdisk
     cd ramdisk
-    gzip -d -c ../ramdisk.gz | cpio -i -d -m  --no-absolute-filenames 2>/dev/null
+
+    gzip -t ../ramdisk.gz
+    if [ $? -gt 0 ]; then
+		$tooldir/lz4 -d ../ramdisk.gz ../ramdisk.cpio
+        cpio -i -d -m  --no-absolute-filenames 2>/dev/null < ../ramdisk.cpio
+    else
+        gzip -d -c ../ramdisk.gz | cpio -i -d -m  --no-absolute-filenames 2>/dev/null
+    fi
     #Unpack Finish to exit.
     pout "Unpack completed."
     exit