diff --git a/cpu/fe310/periph/rtc.c b/cpu/fe310/periph/rtc.c
index 91621c4878..1d4df955f1 100644
--- a/cpu/fe310/periph/rtc.c
+++ b/cpu/fe310/periph/rtc.c
@@ -17,10 +17,6 @@
  * @}
  */
 
-#include <stdlib.h>
-#include <unistd.h>
-#include <time.h>
-
 #include "cpu.h"
 #include "periph_cpu.h"
 #include "periph_conf.h"
@@ -46,38 +42,38 @@ void rtc_init(void)
 
 int rtc_set_time(struct tm *time)
 {
-    time_t t = mktime(time);
+    uint32_t t = rtc_mktime(time);
 
-    rtt_set_counter((uint32_t)t);
+    rtt_set_counter(t);
 
     return 0;
 }
 
 int rtc_get_time(struct tm *time)
 {
-    time_t t = (time_t)rtt_get_counter();
+    uint32_t t = rtt_get_counter();
 
-    gmtime_r(&t, time);
+    rtc_localtime(t, time);
 
     return 0;
 }
 
 int rtc_set_alarm(struct tm *time, rtc_alarm_cb_t cb, void *arg)
 {
-    time_t t = mktime(time);
+    uint32_t t = rtc_mktime(time);
 
     rtc_callback.cb = cb;
 
-    rtt_set_alarm((uint32_t)t, rtc_cb, arg);
+    rtt_set_alarm(t, rtc_cb, arg);
 
     return 0;
 }
 
 int rtc_get_alarm(struct tm *time)
 {
-    time_t t = (time_t)rtt_get_alarm();
+    uint32_t t = rtt_get_alarm();
 
-    gmtime_r(&t, time);
+    rtc_localtime(t, time);
 
     return 0;
 }