diff --git a/repos/libports/src/lib/libc/poll.cc b/repos/libports/src/lib/libc/poll.cc
index 41effddc6..e5cf9a482 100644
--- a/repos/libports/src/lib/libc/poll.cc
+++ b/repos/libports/src/lib/libc/poll.cc
@@ -89,10 +89,10 @@ poll(struct pollfd fds[], nfds_t nfds, int timeout)
 		fds[i].revents = 0;
 		if (fd == -1)
 			continue;
-		if (FD_ISSET(fd, &readfds)) {
+		if ((fds[i].events & POLLIN) && FD_ISSET(fd, &readfds)) {
 			fds[i].revents |= POLLIN;
 		}
-		if (FD_ISSET(fd, &writefds)) {
+		if ((fds[i].events & POLLOUT) && FD_ISSET(fd, &writefds)) {
 			fds[i].revents |= POLLOUT;
 		}
 		if (FD_ISSET(fd, &exceptfds)) {