diff --git a/include/sys/epoll.h b/include/sys/epoll.h
index 1f0312e5..ffe2311f 100644
--- a/include/sys/epoll.h
+++ b/include/sys/epoll.h
@@ -28,6 +28,7 @@ enum EPOLL_EVENTS { __EPOLL_DUMMY };
 #define EPOLLERR 0x008
 #define EPOLLHUP 0x010
 #define EPOLLRDHUP 0x2000
+#define EPOLLEXCLUSIVE (1U<<28)
 #define EPOLLWAKEUP (1U<<29)
 #define EPOLLONESHOT (1U<<30)
 #define EPOLLET (1U<<31)