diff --git a/kqueue.c b/kqueue.c
index 8276f047..51984a4e 100644
--- a/kqueue.c
+++ b/kqueue.c
@@ -176,7 +176,7 @@ kq_sighandler(int sig)
 static void
 kq_setup_kevent(struct kevent *out, evutil_socket_t fd, int filter, short change)
 {
-	memset(out, 0, sizeof(out));
+	memset(out, 0, sizeof(struct kevent));
 	out->ident = fd;
 	out->filter = filter;