diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index dbd8398ddb0b41fa1f391849b82199078e72de70..814a2bb8d2eaf92e30a61a0596a691ee1e7a6d35 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -289,7 +289,7 @@ void do_schedule_next_timer(struct siginfo *info)
 		else
 			schedule_next_timer(timr);
 
-		info->si_overrun = timr->it_overrun_last;
+		info->si_overrun += timr->it_overrun_last;
 	}
 
 	if (timr)