diff --git a/cpu/arm720t/serial_netarm.c b/cpu/arm720t/serial_netarm.c
index a593cbc..1a1b2db 100644
--- a/cpu/arm720t/serial_netarm.c
+++ b/cpu/arm720t/serial_netarm.c
@@ -46,7 +46,7 @@
 /* wait until transmitter is ready for another character */
 #define TXWAITRDY(registers)							\
 {										\
-	ulong tmo = get_timer(0) + 1 * CFG_HZ;					\
+	ulong tmo = get_timer(0) + 1 * CONFIG_SYS_HZ;					\
 	while (((registers)->status_a & NETARM_SER_STATA_TX_RDY) == 0 )	{	\
 		if (get_timer(0) > tmo)						\
 			break;							\