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diff --git a/firmware/drivers/rtc/rtc_as3514.c b/firmware/drivers/rtc/rtc_as3514.c
index 1e53219..f1580c8 100644
--- a/firmware/drivers/rtc/rtc_as3514.c
+++ b/firmware/drivers/rtc/rtc_as3514.c
@@ -142,6 +142,9 @@ void rtc_alarm_poweroff(void)

     seconds -= tm.tm_sec;

+    /* disable MCLK */
+    CGU_AUDIO &= ~((1<11) | (1<<23));
+
     /* write wakeup register */
     alarm.seconds = seconds;
     alarm.enabled = true;