diff --git a/board/r360mpi/flash.c b/board/r360mpi/flash.c
index fef483c..9b42960 100644
--- a/board/r360mpi/flash.c
+++ b/board/r360mpi/flash.c
@@ -107,7 +107,7 @@
 	/* monitor protection ON by default */
 	(void) flash_protect (FLAG_PROTECT_SET,
 				CFG_FLASH_BASE,
-				CFG_FLASH_BASE + CFG_MONITOR_LEN - 1,
+				CFG_FLASH_BASE + monitor_flash_len - 1,
 				&flash_info[0]);
 #endif