diff --git a/os/hal/ports/STM32/LLD/RTCv2/rtc_lld.c b/os/hal/ports/STM32/LLD/RTCv2/rtc_lld.c
index efe843f64..0b471b8f5 100644
--- a/os/hal/ports/STM32/LLD/RTCv2/rtc_lld.c
+++ b/os/hal/ports/STM32/LLD/RTCv2/rtc_lld.c
@@ -138,7 +138,7 @@ static void rtc_decode_date(uint32_t dr, RTCDateTime *timespec) {
                      ((dr >> RTC_TR_MNU_OFFSET) & 15);
   timespec->day   = (((dr >> RTC_DR_DT_OFFSET) & 3) * 10) +
                      ((dr >> RTC_DR_DU_OFFSET) & 15);
-  timespec->dayofweek = (dr >> RTC_DR_WDU_OFFSET) & 1;
+  timespec->dayofweek = (dr >> RTC_DR_WDU_OFFSET) & 7;
 }
 
 /**