diff --git a/source/platform/stm32f1/rtc.c b/source/platform/stm32f1/rtc.c
index 39092e8..75cdb8d 100644
--- a/source/platform/stm32f1/rtc.c
+++ b/source/platform/stm32f1/rtc.c
@@ -35,7 +35,7 @@ static int rtc_set_time(struct tm *time)
 
 int rtc_init(struct tm *time)
 {
-	rtc_auto_awake(RCC_LSI, 0x7fff);
+	rtc_auto_awake(RCC_LSE, 0x7fff);
 	rtc_set_time(time);
 
 	return 0;