Index: uspace/drv/time/cmos-rtc/cmos-rtc.c
===================================================================
--- uspace/drv/time/cmos-rtc/cmos-rtc.c	(revision 80d3f846b70c4427d3fee6bae79e385976a7ff1c)
+++ uspace/drv/time/cmos-rtc/cmos-rtc.c	(revision f6af126bc1cf48f41acf944ed02f22f59d48fdf7)
@@ -386,4 +386,7 @@
 	reg_b = rtc_register_read(rtc, RTC_STATUS_B);
 
+	/* Force 24h mode of operation */
+	rtc_register_write(rtc, RTC_STATUS_B, reg_b | RTC_MASK_24H);
+
 	/* Check if the rtc is working in bcd mode */
 	bcd_mode = !(reg_b & RTC_MASK_BCD);