diff --git a/klippy/chelper/serialqueue.h b/klippy/chelper/serialqueue.h
index 071923e5..9b40b8e7 100644
--- a/klippy/chelper/serialqueue.h
+++ b/klippy/chelper/serialqueue.h
@@ -59,6 +59,7 @@ void serialqueue_send(struct serialqueue *sq, struct command_queue *cq
                       , uint64_t req_clock, uint64_t notify_id);
 void serialqueue_pull(struct serialqueue *sq, struct pull_queue_message *pqm);
 void serialqueue_set_baud_adjust(struct serialqueue *sq, double baud_adjust);
+void serialqueue_set_receive_window(struct serialqueue *sq, int receive_window);
 void serialqueue_set_clock_est(struct serialqueue *sq, double est_freq
                                , double last_clock_time, uint64_t last_clock);
 void serialqueue_get_stats(struct serialqueue *sq, char *buf, int len);