diff --git a/board/renesas/ecovec/ecovec.c b/board/renesas/ecovec/ecovec.c
index 2804d9133d..d862d997e5 100644
--- a/board/renesas/ecovec/ecovec.c
+++ b/board/renesas/ecovec/ecovec.c
@@ -41,7 +41,7 @@ static void debug_led(u8 led)
 int board_late_init(void)
 {
 	u8 mac[6];
-	char env_mac[17];
+	char env_mac[18];
 
 	udelay(1000);