diff --git a/libc/kernel/uapi/linux/eventpoll.h b/libc/kernel/uapi/linux/eventpoll.h
index 3468658..7704cb3 100644
--- a/libc/kernel/uapi/linux/eventpoll.h
+++ b/libc/kernel/uapi/linux/eventpoll.h
@@ -35,4 +35,13 @@
 #else
 #define EPOLL_PACKED
 #endif
+struct epoll_params {
+  __u32 busy_poll_usecs;
+  __u16 busy_poll_budget;
+  __u8 prefer_busy_poll;
+  __u8 __pad;
+};
+#define EPOLL_IOC_TYPE 0x8A
+#define EPIOCSPARAMS _IOW(EPOLL_IOC_TYPE, 0x01, struct epoll_params)
+#define EPIOCGPARAMS _IOR(EPOLL_IOC_TYPE, 0x02, struct epoll_params)
 #endif