diff --git a/drivers/rtc/rx8025.c b/drivers/rtc/rx8025.c
index 064138e9eb6edd0b51de0b762214686a2e8a6ef8..fd6aec5feb0bb5d18c745919cc382f465891f032 100644
--- a/drivers/rtc/rx8025.c
+++ b/drivers/rtc/rx8025.c
@@ -136,7 +136,11 @@ int rtc_get (struct rtc_time *tmp)
 
 	tmp->tm_sec  = bcd2bin (sec & 0x7F);
 	tmp->tm_min  = bcd2bin (min & 0x7F);
-	tmp->tm_hour = bcd2bin (hour & 0x3F);
+	if (rtc_read(RTC_CTL1_REG_ADDR) & RTC_CTL1_BIT_2412)
+		tmp->tm_hour = bcd2bin (hour & 0x3F);
+	else
+		tmp->tm_hour = bcd2bin (hour & 0x1F) % 12 +
+			       ((hour & 0x20) ? 12 : 0);
 	tmp->tm_mday = bcd2bin (mday & 0x3F);
 	tmp->tm_mon  = bcd2bin (mon & 0x1F);
 	tmp->tm_year = bcd2bin (year) + ( bcd2bin (year) >= 70 ? 1900 : 2000);