diff --git a/embed/trezorhal/flash.h b/embed/trezorhal/flash.h
index dbd8bb30f7..33eba804b1 100644
--- a/embed/trezorhal/flash.h
+++ b/embed/trezorhal/flash.h
@@ -47,8 +47,6 @@ extern const uint32_t FLASH_SECTOR_TABLE[FLASH_SECTOR_COUNT + 1];
 
 secbool flash_init(void);
 
-void flash_set_option_bytes(void);
-
 secbool flash_unlock(void);
 secbool flash_lock(void);
 
diff --git a/embed/unix/flash.c b/embed/unix/flash.c
index 44cad6dfb3..26a5ea4713 100644
--- a/embed/unix/flash.c
+++ b/embed/unix/flash.c
@@ -71,10 +71,6 @@ secbool flash_init(void)
     return sectrue;
 }
 
-void flash_set_option_bytes(void)
-{
-}
-
 secbool flash_unlock(void)
 {
     return sectrue;