diff --git a/firmware/drivers/rtc/rtc_e8564.c b/firmware/drivers/rtc/rtc_e8564.c
index 55c67c13c8..8b9f6bfa42 100644
--- a/firmware/drivers/rtc/rtc_e8564.c
+++ b/firmware/drivers/rtc/rtc_e8564.c
@@ -83,7 +83,7 @@ int rtc_read_datetime(struct tm *tm)
     tm->tm_min  = BCD2DEC(buf[1] & 0x7f);
     tm->tm_hour = BCD2DEC(buf[2] & 0x3f);
     tm->tm_mday = BCD2DEC(buf[3] & 0x3f);
-    tm->tm_wday = BCD2DEC(buf[4] & 0x3);
+    tm->tm_wday = BCD2DEC(buf[4] & 0x7);
     tm->tm_mon  = BCD2DEC(buf[5] & 0x1f) - 1;
     tm->tm_year = BCD2DEC(buf[6]) + 100;
 
diff --git a/firmware/drivers/rtc/rtc_m41st84w.c b/firmware/drivers/rtc/rtc_m41st84w.c
index eca61c7f0f..951091c6f2 100644
--- a/firmware/drivers/rtc/rtc_m41st84w.c
+++ b/firmware/drivers/rtc/rtc_m41st84w.c
@@ -261,7 +261,7 @@ int rtc_read_datetime(struct tm *tm)
     tm->tm_sec  = BCD2DEC(buf[0] & 0x7f);
     tm->tm_min  = BCD2DEC(buf[1] & 0x7f);
     tm->tm_hour = BCD2DEC(buf[2] & 0x3f);
-    tm->tm_wday = BCD2DEC(buf[3] & 0x3);
+    tm->tm_wday = BCD2DEC(buf[3] & 0x7);
     tm->tm_mday = BCD2DEC(buf[4] & 0x3f);
     tm->tm_mon  = BCD2DEC(buf[5] & 0x1f) - 1;
     tm->tm_year = BCD2DEC(buf[6]) + 100;