diff --git a/avr/modules/flash/hdl_flash_start.asm b/avr/modules/flash/hdl_flash_start.asm
index e05d27a..b28dbf6 100644
--- a/avr/modules/flash/hdl_flash_start.asm
+++ b/avr/modules/flash/hdl_flash_start.asm
@@ -49,6 +49,7 @@ flashHandleFlashStart:
   brne flashHandleFlashStart_notMe
   ; okay, flash start message is for us
   rcall flashWaitFor100ms
+  clr r16
   rcall flashSendFlashResponse             ; (R15, R16, R17, R18, R19, R20, R21, R22, X)
   sec
   ret