diff --git a/board/lubbock/flash.c b/board/lubbock/flash.c
index dcf829b..9e07b11 100644
--- a/board/lubbock/flash.c
+++ b/board/lubbock/flash.c
@@ -86,7 +86,7 @@
 	 */
 	flash_protect ( FLAG_PROTECT_SET,
 			CFG_FLASH_BASE,
-			CFG_FLASH_BASE + _armboot_end_data - _armboot_start,
+			CFG_FLASH_BASE + monitor_flash_len - 1,
 			&flash_info[0] );
 
 	flash_protect ( FLAG_PROTECT_SET,