diff --git a/c/src/lib/libbsp/arm/lpc24xx/ChangeLog b/c/src/lib/libbsp/arm/lpc24xx/ChangeLog
index c00270c3bf..71cb2ecd5f 100644
--- a/c/src/lib/libbsp/arm/lpc24xx/ChangeLog
+++ b/c/src/lib/libbsp/arm/lpc24xx/ChangeLog
@@ -1,3 +1,8 @@
+2010-11-12	Sebastian Huber <sebastian.huber@embedded-brains.de>
+
+	* misc/system-clocks.c: Use define instead of function call to allow
+	smaller delays.
+
 2010-11-12	Sebastian Huber <sebastian.huber@embedded-brains.de>
 
 	* rtc/rtc-config.c: Fixed type.
diff --git a/c/src/lib/libbsp/arm/lpc24xx/misc/system-clocks.c b/c/src/lib/libbsp/arm/lpc24xx/misc/system-clocks.c
index bdc4cfe2db..df554be646 100644
--- a/c/src/lib/libbsp/arm/lpc24xx/misc/system-clocks.c
+++ b/c/src/lib/libbsp/arm/lpc24xx/misc/system-clocks.c
@@ -62,7 +62,7 @@ void lpc24xx_timer_initialize(void)
 void lpc24xx_micro_seconds_delay(unsigned us)
 {
   unsigned start = lpc24xx_timer();
-  unsigned delay = us * (lpc24xx_cclk() / 1000000);
+  unsigned delay = us * (LPC24XX_CCLK / 1000000);
   unsigned elapsed = 0;
 
   do {