diff --git a/cpu/samd21/periph/rtc.c b/cpu/samd21/periph/rtc.c
index d8076950a5..f8d106d4c6 100644
--- a/cpu/samd21/periph/rtc.c
+++ b/cpu/samd21/periph/rtc.c
@@ -129,7 +129,6 @@ int rtc_set_alarm(struct tm *time, rtc_alarm_cb_t cb, void *arg)
     while (rtcMode2->STATUS.bit.SYNCBUSY);
 
     /* Setup interrupt */
-    NVIC_SetPriority(RTC_IRQn, 10);
     NVIC_EnableIRQ(RTC_IRQn);
 
     /* Enable IRQ */
diff --git a/cpu/samd21/periph/rtt.c b/cpu/samd21/periph/rtt.c
index 3387be1057..b55053fb92 100644
--- a/cpu/samd21/periph/rtt.c
+++ b/cpu/samd21/periph/rtt.c
@@ -102,7 +102,6 @@ void rtt_init(void)
     while (rtcMode0->STATUS.bit.SYNCBUSY);
 
     /* Setup interrupt */
-    NVIC_SetPriority(RTT_IRQ, RTT_IRQ_PRIO);
     NVIC_EnableIRQ(RTT_IRQ);
 
     /* Enable RTC */