diff --git a/patch.py b/patch.py
index 4ba6510..70429a7 100644
--- a/patch.py
+++ b/patch.py
@@ -86,7 +86,7 @@ def patch_initrd_xz(initrd_xz:bytes,key_dict:dict,ljust=True):
             new_initrd = new_initrd.replace(old_public_key,new_public_key)
     preset = 6
     new_initrd_xz = lzma.compress(new_initrd,check=lzma.CHECK_CRC32,filters=[{"id": lzma.FILTER_LZMA2, "preset": preset }] )
-    while len(new_initrd_xz) > len(initrd_xz) and preset < 10:
+    while len(new_initrd_xz) > len(initrd_xz) and preset < 9:
         print(f'preset:{preset}')
         print(f'new initrd xz size:{len(new_initrd_xz)}')
         print(f'old initrd xz size:{len(initrd_xz)}')