diff --git a/cpu/ixp/timer.c b/cpu/ixp/timer.c
index 920f34e..09d8ad5 100644
--- a/cpu/ixp/timer.c
+++ b/cpu/ixp/timer.c
@@ -44,7 +44,7 @@
 	 * This function has a max usec, but since it is called from udelay
 	 * we should not have to worry... be happy
 	 */
-	unsigned long usecs = CFG_HZ/1000000L & ~IXP425_OST_RELOAD_MASK;
+	unsigned long usecs = CONFIG_SYS_HZ/1000000L & ~IXP425_OST_RELOAD_MASK;
 
 	*IXP425_OSST = IXP425_OSST_TIMER_1_PEND;
 	usecs |= IXP425_OST_ONE_SHOT | IXP425_OST_ENABLE;