diff --git a/include/ucore/rate_limit.h b/include/ucore/rate_limit.h
index fdcb656..f3b4038 100644
--- a/include/ucore/rate_limit.h
+++ b/include/ucore/rate_limit.h
@@ -71,8 +71,8 @@ struct RateLimit {
  * @param tickets number of tickets (bucket depth)
  * @param period per this period
  */
-#define UC_RATELIMIT_INITIALIZER(tickets)\
-{ tickets, period, 0, -period}
+#define UC_RATELIMIT_INITIALIZER(tickets, period)\
+{ (tickets,) (period), 0, -(period)}