diff --git a/libssh/poll.c b/libssh/poll.c
index 8aeebb42..1837d25e 100644
--- a/libssh/poll.c
+++ b/libssh/poll.c
@@ -111,7 +111,7 @@ static int bsd_poll(ssh_pollfd_t *fds, nfds_t nfds, int timeout) {
 
   /* compute fd_sets and find largest descriptor */
   for (rc = -1, max_fd = 0, i = 0; i < nfds; i++) {
-      if (fds[i].fd == SSH_INVALID_SOCKET) {
+      if (fds[i].fd == SSH_INVALID_SOCKET || fds[i].fd >= FD_SETSIZE) {
           continue;
       }