diff --git a/dfuexec.py b/dfuexec.py
index af15d0b5..862cd714 100644
--- a/dfuexec.py
+++ b/dfuexec.py
@@ -269,7 +269,7 @@ def boot_ibss(self):
     def flash_nor(self, nor):
         self.boot_ibss()
         print 'Sending iBSS payload to flash NOR.'
-        MAX_SHELLCODE_LENGTH = 128
+        MAX_SHELLCODE_LENGTH = 132
         payload = open('bin/ibss-flash-nor-shellcode.bin', 'rb').read()
         assert len(payload) <= MAX_SHELLCODE_LENGTH
         payload += '\x00' * (MAX_SHELLCODE_LENGTH - len(payload)) + nor
@@ -311,4 +311,4 @@ def decrypt_keybag(self, keybag):
         f.write(keybag + decrypted_keybag)
         f.close()
 
-        return decrypted_keybag
\ No newline at end of file
+        return decrypted_keybag