diff --git a/components/libc/posix/io/poll/poll.c b/components/libc/posix/io/poll/poll.c
index 3c5940b8d3..ba2442c0d5 100644
--- a/components/libc/posix/io/poll/poll.c
+++ b/components/libc/posix/io/poll/poll.c
@@ -168,6 +168,7 @@ static int poll_do(struct pollfd *fds, nfds_t nfds, struct rt_poll_table *pt, in
     {
         pf = fds;
         num = 0;
+        pt->triggered = 0;
 
         for (n = 0; n < nfds; n ++)
         {