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-rw-r--r--esp8266/modpybrtc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/esp8266/modpybrtc.c b/esp8266/modpybrtc.c
index 9685248034..500b2bc545 100644
--- a/esp8266/modpybrtc.c
+++ b/esp8266/modpybrtc.c
@@ -212,7 +212,7 @@ STATIC mp_obj_t pyb_rtc_alarm(mp_obj_t self_in, mp_obj_t alarm_id, mp_obj_t time
}
// set expiry time (in microseconds)
- pyb_rtc_alarm0_expiry = pyb_rtc_get_us_since_2000() + mp_obj_get_int(time_in) * 1000;
+ pyb_rtc_alarm0_expiry = pyb_rtc_get_us_since_2000() + (uint64_t)mp_obj_get_int(time_in) * 1000;
return mp_const_none;