1 files changed, 2 insertions, 0 deletions

diff --git a/firmware/common/timefuncs.c b/firmware/common/timefuncs.c
index af4b596dd0..cffdb3951a 100644
--- a/firmware/common/timefuncs.c
+++ b/firmware/common/timefuncs.c
@@ -105,6 +105,7 @@ int set_time(const struct tm *tm)
 #endif /* RTC */
 }
 
+#if CONFIG_RTC
 void set_day_of_week(struct tm *tm)
 {
     int y=tm->tm_year+1900;
@@ -115,4 +116,5 @@ void set_day_of_week(struct tm *tm)
     if(m == 0 || m == 1) y--;
     tm->tm_wday = (d + mo[m] + y + y/4 - y/100 + y/400) % 7;
 }
+#endif /* CONFIG_RTC */