diff --git a/firmware/common/timefuncs.c b/firmware/common/timefuncs.c
index cffdb3951a..af4b596dd0 100644
--- a/firmware/common/timefuncs.c
+++ b/firmware/common/timefuncs.c
@@ -105,7 +105,6 @@ 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;
@@ -116,5 +115,4 @@ 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 */
 
diff --git a/firmware/include/timefuncs.h b/firmware/include/timefuncs.h
index 4c5f0fbb42..b7e9be53c6 100644
--- a/firmware/include/timefuncs.h
+++ b/firmware/include/timefuncs.h
@@ -30,8 +30,8 @@ struct tm *get_time(void);
 int set_time(const struct tm *tm);
 #if CONFIG_RTC
 bool valid_time(const struct tm *tm);
-void set_day_of_week(struct tm *tm);
 #endif
+void set_day_of_week(struct tm *tm);
 
 #endif /* _TIMEFUNCS_H_ */