diff --git a/usbexec.py b/usbexec.py
index 43e2bc78..aa09226e 100644
--- a/usbexec.py
+++ b/usbexec.py
@@ -25,7 +25,7 @@ def match(self, info):
 DONE_MAGIC = 'donedone'[::-1]
 MEMC_MAGIC = 'memcmemc'[::-1]
 MEMS_MAGIC = 'memsmems'[::-1]
-USB_READ_LIMIT  = 0x8000
+USB_READ_LIMIT  = 0xFF0
 CMD_TIMEOUT     = 5000
 AES_BLOCK_SIZE  = 16
 AES_ENCRYPT     = 16