diff --git a/repos/libports/src/lib/libc/poll.cc b/repos/libports/src/lib/libc/poll.cc
index b75bd5c85..aaa8079a0 100644
--- a/repos/libports/src/lib/libc/poll.cc
+++ b/repos/libports/src/lib/libc/poll.cc
@@ -125,7 +125,7 @@ int ppoll(struct pollfd fds[], nfds_t nfds,
           const sigset_t*)
 {
 	int timeout_ms = timeout ?
-	                 (timeout->tv_sec * 1000 + timeout->tv_nsec / 1000) :
+	                 (timeout->tv_sec * 1000 + timeout->tv_nsec / 1000000) :
 	                 -1;
 	return poll(fds, nfds, timeout_ms);
 }