diff --git a/sys/shell/commands/sc_rtc.c b/sys/shell/commands/sc_rtc.c
index 4e8ca64ebaf5..1402fd42b975 100644
--- a/sys/shell/commands/sc_rtc.c
+++ b/sys/shell/commands/sc_rtc.c
@@ -34,7 +34,6 @@ static void _alarm_handler(void *arg)
     (void) arg;
 
     puts("The alarm rang");
-    return 0;
 }
 
 static int dow(int year, int month, int day)