diff --git a/ports/atmel-samd/supervisor/port.c b/ports/atmel-samd/supervisor/port.c
index b3903bb862..f232572e47 100644
--- a/ports/atmel-samd/supervisor/port.c
+++ b/ports/atmel-samd/supervisor/port.c
@@ -174,6 +174,7 @@ static void rtc_init(void) {
     #endif
     NVIC_ClearPendingIRQ(RTC_IRQn);
     NVIC_EnableIRQ(RTC_IRQn);
+    rtc_reset();
 }
 
 safe_mode_t port_init(void) {