diff --git a/src/ax25.c b/src/ax25.c
index 7082d86..67c003a 100644
--- a/src/ax25.c
+++ b/src/ax25.c
@@ -195,7 +195,7 @@ int patty_ax25_next_event(patty_ax25 *ax25, patty_ax25_event *ev) {
         memcpy(&ax25->unix_fds_pending_write, &ax25->unix_fds, sizeof(ax25->unix_fds));
         memcpy(&ax25->unix_fds_pending_error, &ax25->unix_fds, sizeof(ax25->unix_fds));
 
-        if (select(ax25->unix_fdmax,
+        if (select(ax25->unix_fdmax + 1,
           &ax25->unix_fds_pending_read,
           &ax25->unix_fds_pending_write,
           &ax25->unix_fds_pending_error,