diff --git a/drivers/rtc/ds12887.c b/drivers/rtc/ds12887.c
index fb1825b..25ca133 100644
--- a/drivers/rtc/ds12887.c
+++ b/drivers/rtc/ds12887.c
@@ -154,7 +154,7 @@
 	return 0;
 }
 
-void rtc_set (struct rtc_time *tmp)
+int rtc_set (struct rtc_time *tmp)
 {
 	uchar save_ctrl_b;
 	uchar sec, min, hour, mday, wday, mon, year;
@@ -202,6 +202,8 @@
 	/* enables the RTC to update the regs */
 	save_ctrl_b &= ~RTC_CB_SET;
 	rtc_write(RTC_CONTROL_B, save_ctrl_b);
+
+	return 0;
 }
 
 void rtc_reset (void)