diff --git a/drivers/rtc/rtc-rzn1.c b/drivers/rtc/rtc-rzn1.c
index f3268655fd37..42e57bf0b4aa 100644
--- a/drivers/rtc/rtc-rzn1.c
+++ b/drivers/rtc/rtc-rzn1.c
@@ -281,6 +281,11 @@ static int rzn1_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 	if (alarm > farest)
 		return -ERANGE;
 
+	/* Disable alarm interrupts before reprogramming the alarm. */
+	ret = rzn1_rtc_alarm_irq_enable(dev, 0);
+	if (ret)
+		return ret;
+
 	writel(bin2bcd(tm->tm_min), rtc->base + RZN1_RTC_ALM);
 	writel(bin2bcd(tm->tm_hour), rtc->base + RZN1_RTC_ALH);
 	writel(BIT(tm->tm_wday), rtc->base + RZN1_RTC_ALW);