diff --git a/cpu/lpc2387/include/lpc2387-rtc.h b/cpu/lpc2387/include/lpc2387-rtc.h
index 4fb8f52e51..9420fc7c21 100644
--- a/cpu/lpc2387/include/lpc2387-rtc.h
+++ b/cpu/lpc2387/include/lpc2387-rtc.h
@@ -51,7 +51,6 @@ and the mailinglist (subscription via web site)
 #include <time.h>
 #include <sys/time.h>
 #include "lpc2387.h"
-#include "clock.h"
 
 /* ------------------------------------------------------------------------- */
 /**
diff --git a/cpu/lpc2387/lpc2387-rtc.c b/cpu/lpc2387/lpc2387-rtc.c
index 7ab60e09c4..ca713833a0 100644
--- a/cpu/lpc2387/lpc2387-rtc.c
+++ b/cpu/lpc2387/lpc2387-rtc.c
@@ -45,7 +45,6 @@ and the mailinglist (subscription via web site)
 #include "lpc2387.h"
 #include "lpc2387-rtc.h"
 #include "lpm.h"
-#include "clock.h"
 
 #define PREINT_RTC	0x000001C8  /* Prescaler value, integer portion, PCLK = 15Mhz */
 #define PREFRAC_RTC	0x000061C0  /* Prescaler value, fraction portion, PCLK = 15Mhz */
@@ -58,7 +57,6 @@ and the mailinglist (subscription via web site)
 #define PRINTF(fmt, args...)
 #endif
 
-extern void _clock_alarm(void);
 
 /**
  * @brief	epoch time in hour granularity
@@ -155,7 +153,6 @@ void RTC_IRQHandler (void)
 		RTC_AMR = 0xff;						// disable alarm irq
 		PRINTF("alarm");
 		lpm_end_awake();
-		_clock_alarm();
 	}
 
 	VICVectAddr = 0;						// Acknowledge Interrupt
diff --git a/sys/include/swtimer.h b/sys/include/swtimer.h
index 9f7d9a9730..0cc30f82c0 100644
--- a/sys/include/swtimer.h
+++ b/sys/include/swtimer.h
@@ -64,14 +64,23 @@ typedef struct swtimer_t {
     } action;
 } swtimer_t;
 
+/**
+ * @brief   Current system time
+ * @return  Time in ticks since system boot
+ */
 swtime_t swtimer_now();
 
+/**
+ * @brief   Initializes swtimer
+ * @return  always 0
+ */
 int swtimer_init();
 
 /**
  * @brief   set swtimer interval and activate 
  * @param[in]   t           pointer to preinitialised swtimer_t
  * @param[in]   interval    swtimer interval
+ * @return  always 0
  */
 int swtimer_set(swtimer_t *t, swtime_t interval);