diff --git a/src/backend/storage/ipc/latch.c b/src/backend/storage/ipc/latch.c
index eb3a569aae..8bdb5497aa 100644
--- a/src/backend/storage/ipc/latch.c
+++ b/src/backend/storage/ipc/latch.c
@@ -1487,7 +1487,7 @@ WaitEventSetWaitBlock(WaitEventSet *set, int cur_timeout,
 
 	/* Sleep */
 	rc = epoll_wait(set->epoll_fd, set->epoll_ret_events,
-					nevents, cur_timeout);
+					Min(nevents, set->nevents_space), cur_timeout);
 
 	/* Check return code */
 	if (rc < 0)
@@ -1647,7 +1647,8 @@ WaitEventSetWaitBlock(WaitEventSet *set, int cur_timeout,
 
 	/* Sleep */
 	rc = kevent(set->kqueue_fd, NULL, 0,
-				set->kqueue_ret_events, nevents,
+				set->kqueue_ret_events,
+				Min(nevents, set->nevents_space),
 				timeout_p);
 
 	/* Check return code */