diff --git a/util/main-loop.c b/util/main-loop.c
index e1e349ca5c..a9f4e8de75 100644
--- a/util/main-loop.c
+++ b/util/main-loop.c
@@ -422,7 +422,7 @@ static int os_host_main_loop_wait(int64_t timeout)
     g_main_context_prepare(context, &max_priority);
     n_poll_fds = g_main_context_query(context, max_priority, &poll_timeout,
                                       poll_fds, ARRAY_SIZE(poll_fds));
-    g_assert(n_poll_fds <= ARRAY_SIZE(poll_fds));
+    g_assert(n_poll_fds + w->num <= ARRAY_SIZE(poll_fds));
 
     for (i = 0; i < w->num; i++) {
         poll_fds[n_poll_fds + i].fd = (DWORD_PTR)w->events[i];